[REGRESSION]: AzureAppConfiguration@10 unable to retrieve token.

### New issue checklist

- [x] I searched for [existing GitHub issues](https://github.com/microsoft/azure-pipelines-tasks/issues)
- [ ] I read [pipeline troubleshooting guide](https://docs.microsoft.com/vsts/build-release/actions/troubleshooting)
- [ ] I checked [how to collect logs](https://learn.microsoft.com/azure/devops/pipelines/troubleshooting/review-logs?view=azure-devops)

### Task name

AzureAppConfiguration

### Breaking task version

10.271.0

### Last working task version

6.5.0

### Regression Description

Customer upgraded the AzureAppConfiguration@6 task to AzureAppConfiguration@10 and since then, the pipeline is failing with the below error:
Error message: "agent-base" has no default implementation, you must subclass and override `callback()` 

### Environment type (Please select at least one enviroment where you face this issue)

- [x] Self-Hosted
- [ ] Microsoft Hosted
- [x] VMSS Pool
- [ ] Container

### Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

### Azure DevOps Server Version (if applicable)

_No response_

### Operation system

Ubuntu 22.04

### Relevant log output

```shell
Name: RestError 
Code: REQUEST_SEND_ERROR 
Status code:undefined 
Url: https://<app-name>.azconfig.io/kv?api-version=2023-10-01&key=%2Fctlplat%2Fdbaas%2Frest%2F*&label=%00 
Error message: "agent-base" has no default implementation, you must subclass and override `callback()` 
ClientRequestId: 2c534fda-ed40-4cde-affb-d0068f2b399b
```

### Full task logs with system.debug enabled

<details>
  <summary>UNSUCCESSFUL RUN</summary>
  <pre> 2026-05-22T05:14:59.5481787Z ##[debug]Evaluating condition for step: 'Gathering App Config'
2026-05-22T05:14:59.5483404Z ##[debug]Evaluating: SucceededNode()
2026-05-22T05:14:59.5484151Z ##[debug]Evaluating SucceededNode:
2026-05-22T05:14:59.5485420Z ##[debug]Result: True
2026-05-22T05:14:59.5487968Z ##[section]Starting: Gathering App Config
2026-05-22T05:14:59.5510133Z ==============================================================================
2026-05-22T05:14:59.5510821Z Task         : Azure App Configuration Export
2026-05-22T05:14:59.5511425Z Description  : Export key-values from Azure App Configuration to task variables in your build or deployment pipelines
2026-05-22T05:14:59.5512101Z Version      : 10.271.0
2026-05-22T05:14:59.5512507Z Author       : Microsoft Corporation
2026-05-22T05:14:59.5512951Z Help         : https://learn.microsoft.com/azure/azure-app-configuration/azure-pipeline-export-task
2026-05-22T05:14:59.5513490Z ==============================================================================
2026-05-22T05:14:59.6701036Z ##[debug]Using node path: /agent/externals/node24/bin/node
2026-05-22T05:14:59.7215356Z ##[debug]system.debug=True
2026-05-22T05:14:59.7217979Z ##[debug]DistributedTask.Tasks.Node.SkipDebugLogsWhenDebugModeOff=True
2026-05-22T05:14:59.7243585Z ##[debug]agent.TempDirectory=/agent/_work/_temp
2026-05-22T05:14:59.7257563Z ##[debug]loading inputs and endpoints
2026-05-22T05:14:59.7274705Z ##[debug]loading INPUT_CONNECTEDSERVICENAME
2026-05-22T05:14:59.7291124Z ##[debug]loading INPUT_APPCONFIGURATIONENDPOINT
2026-05-22T05:14:59.7303769Z ##[debug]loading INPUT_SELECTIONMODE
2026-05-22T05:14:59.7306333Z ##[debug]loading INPUT_KEYFILTER
2026-05-22T05:14:59.7308894Z ##[debug]loading INPUT_TRIMKEYPREFIX
2026-05-22T05:14:59.7311917Z ##[debug]loading INPUT_SUPPRESSWARNINGFOROVERRIDDENKEYS
2026-05-22T05:14:59.7314635Z ##[debug]loading INPUT_TREATKEYVAULTERRORSASWARNING
2026-05-22T05:14:59.7317321Z ##[debug]loading ENDPOINT_AUTH_id
2026-05-22T05:14:59.7374647Z ##[debug]loading ENDPOINT_AUTH_SCHEME_id
2026-05-22T05:14:59.7377386Z ##[debug]loading ENDPOINT_AUTH_PARAMETER_id_TENANTID
2026-05-22T05:14:59.7380502Z ##[debug]loading ENDPOINT_AUTH_PARAMETER_id_SERVICEPRINCIPALID
2026-05-22T05:14:59.7407019Z ##[debug]loading ENDPOINT_AUTH_PARAMETER_id_AUTHENTICATIONTYPE
2026-05-22T05:14:59.7410204Z ##[debug]loading ENDPOINT_AUTH_PARAMETER_id_SERVICEPRINCIPALKEY
2026-05-22T05:14:59.7412845Z ##[debug]loading ENDPOINT_AUTH_SYSTEMVSSCONNECTION
2026-05-22T05:14:59.7415232Z ##[debug]loading ENDPOINT_AUTH_SCHEME_SYSTEMVSSCONNECTION
2026-05-22T05:14:59.7417628Z ##[debug]loading ENDPOINT_AUTH_PARAMETER_SYSTEMVSSCONNECTION_ACCESSTOKEN
2026-05-22T05:14:59.7420547Z ##[debug]loading SECRET_SYSTEM_ACCESSTOKEN
2026-05-22T05:14:59.7422875Z ##[debug]loaded 17
2026-05-22T05:14:59.7425426Z ##[debug]Agent.ProxyUrl=http://192.168.1.1:8080
2026-05-22T05:14:59.7427835Z ##[debug]Agent.ProxyUsername=undefined
2026-05-22T05:14:59.7430429Z ##[debug]Agent.ProxyPassword=undefined
2026-05-22T05:14:59.7434791Z ##[debug]Agent.ProxyBypassList=["<removed internal sites>"]
2026-05-22T05:14:59.7465108Z ##[debug]expose agent proxy configuration.
2026-05-22T05:14:59.7467940Z ##[debug]Agent.CAInfo=undefined
2026-05-22T05:14:59.7470707Z ##[debug]Agent.ClientCert=undefined
2026-05-22T05:14:59.7473356Z ##[debug]Agent.SkipCertValidation=undefined
2026-05-22T05:15:00.0000862Z ##[debug]agent.proxyurl=http://192.168.1.1:8080
2026-05-22T05:15:00.0002703Z ##[debug]agent.proxyusername=undefined
2026-05-22T05:15:00.0003963Z ##[debug]agent.proxypassword=undefined
2026-05-22T05:15:00.0005948Z ##[debug]agent.proxybypasslist=["<removed internal sites>"]
2026-05-22T05:15:00.0008823Z ##[debug]agent.proxybypasslist=["<removed internal sites>"]
2026-05-22T05:15:00.0012414Z ##[debug]VSTS_ARM_REST_IGNORE_SSL_ERRORS=undefined
2026-05-22T05:15:00.0013609Z ##[debug]AZURE_HTTP_USER_AGENT=VSTS_e99f0146-bd0f-443b-9865-7bc4fe807b64_build_58083_0
2026-05-22T05:15:00.0014995Z ##[debug]check path : /agent/_work/_tasks/AzureAppConfigurationExport_81fa1f14-66ef-4e75-93fd-30b8ee7140d6/10.271.0/node_modules/azure-pipelines-tasks-azure-arm-rest/module.json
2026-05-22T05:15:00.0016553Z ##[debug]adding resource file: /agent/_work/_tasks/AzureAppConfigurationExport_81fa1f14-66ef-4e75-93fd-30b8ee7140d6/10.271.0/node_modules/azure-pipelines-tasks-azure-arm-rest/module.json
2026-05-22T05:15:00.0017882Z ##[debug]system.culture=en-US
2026-05-22T05:15:00.0019032Z ##[debug]Using msalv3
2026-05-22T05:15:00.0711529Z ##[debug]Agent.TempDirectory=/agent/_work/_temp
2026-05-22T05:15:00.1018360Z ##[debug]check path : /agent/_work/_tasks/AzureAppConfigurationExport_81fa1f14-66ef-4e75-93fd-30b8ee7140d6/10.271.0/task.json
2026-05-22T05:15:00.1030961Z ##[debug]adding resource file: /agent/_work/_tasks/AzureAppConfigurationExport_81fa1f14-66ef-4e75-93fd-30b8ee7140d6/10.271.0/task.json
2026-05-22T05:15:00.1033286Z ##[debug]system.culture=en-US
2026-05-22T05:15:00.1038626Z ##[debug]SelectionMode=Default
2026-05-22T05:15:00.1040796Z ##[debug]AppConfigurationEndpoint=https://<app-name>.azconfig.io
2026-05-22T05:15:00.1042829Z ##[debug]KeyFilter=/ctlplat/dbaas/rest/*
2026-05-22T05:15:00.1044848Z ##[debug]SnapshotName=undefined
2026-05-22T05:15:00.1047067Z ##[debug]Label=undefined
2026-05-22T05:15:00.1050359Z ##[debug]SuppressWarningForOverriddenKeys=false
2026-05-22T05:15:00.1052473Z ##[debug]TreatKeyVaultErrorsAsWarning=false
2026-05-22T05:15:00.1054292Z ##[debug]TrimKeyPrefix=/ctlplat/dbaas/rest/
2026-05-22T05:15:00.1055925Z ##[debug]ConnectedServiceName=4e3470de-fe26-42c1-8cff-35b855075446
2026-05-22T05:15:00.1057940Z ##[debug]USE_MSAL=true
2026-05-22T05:15:00.1060038Z ##[debug]MSAL - USE_MSAL override is found: true
2026-05-22T05:15:00.1061873Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 auth scheme = ServicePrincipal
2026-05-22T05:15:00.1063849Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 data subscriptionid = <id>
2026-05-22T05:15:00.1065523Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 data subscriptionname =<subscription name>
2026-05-22T05:15:00.1067497Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 auth param serviceprincipalid = ***
2026-05-22T05:15:00.1070923Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 data activeDirectoryAuthority = https://login.microsoftonline.com/
2026-05-22T05:15:00.1072769Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 auth param tenantid = id
2026-05-22T05:15:00.1074590Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446=https://management.azure.com/
2026-05-22T05:15:00.1076793Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 data environment = AzureCloud
2026-05-22T05:15:00.1078852Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 auth scheme = ServicePrincipal
2026-05-22T05:15:00.1081428Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 data msiclientId = undefined
2026-05-22T05:15:00.1083318Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 data activeDirectoryServiceEndpointResourceId = https://management.core.windows.net/
2026-05-22T05:15:00.1085306Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 data AzureKeyVaultServiceEndpointResourceId = https://vault.azure.net
2026-05-22T05:15:00.1087260Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 data AzureKeyVaultDnsSuffix = vault.azure.net
2026-05-22T05:15:00.1089418Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 data ScopeLevel = Subscription
2026-05-22T05:15:00.1103645Z ##[debug]MSAL - getEndpoint - useGraphActiveDirectoryResource=false
2026-05-22T05:15:00.1105178Z ##[debug]MSAL - getEndpoint - useMSAL=true
2026-05-22T05:15:00.1107056Z ##[debug]MSAL - getEndpoint - endpoint={"subscriptionID":"<id>","subscriptionName":"<subscripiton name>","servicePrincipalClientID":"***","environmentAuthorityUrl":"https://login.microsoftonline.com/","tenantID":"id","url":"https://management.azure.com/","environment":"AzureCloud","scheme":"ServicePrincipal","activeDirectoryResourceID":"https://management.core.windows.net/","azureKeyVaultServiceEndpointResourceId":"https://vault.azure.net","azureKeyVaultDnsSuffix":"vault.azure.net","scopeLevel":"Subscription"}
2026-05-22T05:15:00.1121724Z ##[debug]MSAL - getEndpoint - connectedServiceName=id
2026-05-22T05:15:00.1123112Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 auth param authenticationType = spnKey
2026-05-22T05:15:00.1124433Z ##[debug]credentials spn endpoint
2026-05-22T05:15:00.1125934Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 auth param serviceprincipalkey = ***
2026-05-22T05:15:00.1127740Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 data EnableAdfsAuthentication = false
2026-05-22T05:15:00.1129517Z ##[debug]Feature 'ALLOWSCOPELEVELTOKEN' not found. Returning false as default.
2026-05-22T05:15:00.1131145Z ##[debug]4e3470de-fe26-42c1-8cff-35b855075446 auth param apitoken = undefined
2026-05-22T05:15:00.1133931Z ##[debug]{"subscriptionID":"<id>","subscriptionName":"<subscripiton name>","servicePrincipalClientID":"***","environmentAuthorityUrl":"https://login.microsoftonline.com/","tenantID":"id","url":"https://management.azure.com/","environment":"AzureCloud","scheme":"ServicePrincipal","activeDirectoryResourceID":"https://management.azure.com/","azureKeyVaultServiceEndpointResourceId":"https://vault.azure.net","azureKeyVaultDnsSuffix":"vault.azure.net","scopeLevel":"Subscription","authenticationType":"spnKey","servicePrincipalKey":***,"isADFSEnabled":false,"applicationTokenCredentials":{"connectedServiceName":"4e3470de-fe26-42c1-8cff-35b855075446","clientId":"***","tenantId":"id","baseUrl":"https://management.azure.com/","authorityUrl":"https://login.microsoftonline.com/","activeDirectoryResourceId":"https://management.azure.com/","isAzureStackEnvironment":false,"authType":"spnKey","secret":***,"isADFSEnabled":false,"useMSAL":true,"allowScopeLevelToken":false,"tokenMutex":{"_semaphore":{"_value":1,"_cancelError":{},"_weightedQueues":[],"_weightedWaiters":[]}}}}
2026-05-22T05:15:00.1158280Z Azure App Configuration Export Task is starting up...
2026-05-22T05:15:00.1158924Z Azure Subscription: <subscripiton name>
2026-05-22T05:15:00.1160113Z App Configuration Endpoint: https://<app-name>.azconfig.io
2026-05-22T05:15:00.1160736Z Selection Mode: Default
2026-05-22T05:15:00.1161247Z Key Filter: '/ctlplat/dbaas/rest/*'
2026-05-22T05:15:00.1161846Z Label Filter: (No label)
2026-05-22T05:15:00.1445275Z ##[debug]MSAL - getMSALToken called. force=true
2026-05-22T05:15:00.1467185Z ##[debug]system.debug=True
2026-05-22T05:15:00.1468529Z ##[debug]system.debug=True
2026-05-22T05:15:00.1470132Z ##[debug]agent.proxyurl=http://192.168.1.1:8080
2026-05-22T05:15:00.1471307Z ##[debug]agent.proxyurl=http://192.168.1.1:8080
2026-05-22T05:15:00.1473480Z ##[debug]agent.proxybypasslist=["<internal sites>"]
2026-05-22T05:15:00.1476543Z ##[debug]agent.proxybypasslist=["<internal sites>"]
2026-05-22T05:15:00.1478727Z ##[debug]MSAL - Proxy will be used.
2026-05-22T05:15:00.1480300Z ##[debug]agent.proxyusername=undefined
2026-05-22T05:15:00.1481394Z ##[debug]agent.proxypassword=undefined
2026-05-22T05:15:00.1482516Z ##[debug]MSAL - Proxy setup with no-auth is: http://192.168.1.1:8080
2026-05-22T05:15:00.1483869Z ##[debug]MSAL - ServicePrincipal - clientSecret is used.
2026-05-22T05:15:00.1485142Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Clearing cache entries created by MSAL
2026-05-22T05:15:00.1486326Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Retrieving all cache keys
2026-05-22T05:15:00.1487690Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting cache key-value store
2026-05-22T05:15:00.1514409Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Info - acquireTokenByClientCredential called
2026-05-22T05:15:00.1515847Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - initializeRequestScopes called
2026-05-22T05:15:00.1517171Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [03aea832-1b31-4583-89b6-e0f0507c364a] : @azure/msal-node@3.8.0 : Verbose - createAuthority called
2026-05-22T05:15:00.1518511Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Executing function authorityResolveEndpointsAsync
2026-05-22T05:15:00.1540504Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Retrieving all cache keys
2026-05-22T05:15:00.1541741Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting cache key-value store
2026-05-22T05:15:00.1543146Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Executing function authorityUpdateCloudDiscoveryMetadata
2026-05-22T05:15:00.1544489Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - Attempting to get cloud discovery metadata  from authority configuration
2026-05-22T05:15:00.1545828Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - Known Authorities: 
2026-05-22T05:15:00.1547364Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - Authority Metadata: N/A
2026-05-22T05:15:00.1548912Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - Canonical Authority: https://login.microsoftonline.com/id/
2026-05-22T05:15:00.1550827Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - Did not find cloud discovery metadata in the config... Attempting to get cloud discovery metadata from the hardcoded values.
2026-05-22T05:15:00.1552482Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - Found cloud discovery metadata from hardcoded values.
2026-05-22T05:15:00.1554059Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Returning result from authorityUpdateCloudDiscoveryMetadata
2026-05-22T05:15:00.1555590Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Executing function authorityUpdateEndpointMetadata
2026-05-22T05:15:00.1557196Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - Attempting to get endpoint metadata from authority configuration
2026-05-22T05:15:00.1558722Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - Did not find endpoint metadata in the config... Attempting to get endpoint metadata from the hardcoded values.
2026-05-22T05:15:00.1580824Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Returning result from authorityUpdateEndpointMetadata
2026-05-22T05:15:00.1582426Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Item key: authority-metadata-***-login.windows.net
2026-05-22T05:15:00.1583912Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting cache key-value store
2026-05-22T05:15:00.1585280Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Setting cache key value store
2026-05-22T05:15:00.1586865Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Returning result from authorityResolveEndpointsAsync
2026-05-22T05:15:00.1588423Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [03aea832-1b31-4583-89b6-e0f0507c364a] : @azure/msal-node@3.8.0 : Verbose - buildOauthClientConfiguration called
2026-05-22T05:15:00.1590047Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - Replacing tenant domain name id with id {tenantid}
2026-05-22T05:15:00.1591450Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [03aea832-1b31-4583-89b6-e0f0507c364a] : @azure/msal-node@3.8.0 : Info - Building oauth client configuration with the following authority: https://login.microsoftonline.com/id/oauth2/v2.0/token.
2026-05-22T05:15:00.1593166Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [03aea832-1b31-4583-89b6-e0f0507c364a] : @azure/msal-node@3.8.0 : Verbose - Client credential client created
2026-05-22T05:15:00.1594659Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting in-memory cache
2026-05-22T05:15:00.1596155Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting cache key-value store
2026-05-22T05:15:00.1597710Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - Replacing tenant domain name id with id {tenantid}
2026-05-22T05:15:00.1619382Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Item key: server-telemetry-***
2026-05-22T05:15:00.1621303Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting cache key-value store
2026-05-22T05:15:00.1623181Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Item key: server-telemetry-***
2026-05-22T05:15:00.1624936Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting cache key-value store
2026-05-22T05:15:00.1626772Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Verbose - Replacing tenant domain name id with id {tenantid}
2026-05-22T05:15:00.1628827Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [03aea832-1b31-4583-89b6-e0f0507c364a] : @azure/msal-common@15.13.0 : Info - Sending token request to endpoint: https://login.microsoftonline.com/id/oauth2/v2.0/token
2026-05-22T05:15:00.1631294Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Item key: throttling.{"clientId":"***","authority":"https://login.microsoftonline.com/id","scopes":["https://<app-name>.azconfig.io/.default"],"authenticationScheme":"Bearer"}
2026-05-22T05:15:00.1633182Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting cache key-value store
2026-05-22T05:15:00.1634830Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [03aea832-1b31-4583-89b6-e0f0507c364a] : @azure/msal-common@15.13.0 : Trace - Executing function networkClientSendPostRequestAsync
2026-05-22T05:15:00.3703705Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [03aea832-1b31-4583-89b6-e0f0507c364a] : @azure/msal-common@15.13.0 : Trace - Returning result from networkClientSendPostRequestAsync
2026-05-22T05:15:00.3705285Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Item key: server-telemetry-***
2026-05-22T05:15:00.3706609Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting cache key-value store
2026-05-22T05:15:00.3708138Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Item key: server-telemetry-***
2026-05-22T05:15:00.3716796Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting cache key-value store
2026-05-22T05:15:00.3718304Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [03aea832-1b31-4583-89b6-e0f0507c364a] : @azure/msal-common@15.13.0 : Warning - No client info in response
2026-05-22T05:15:00.3720111Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting in-memory cache
2026-05-22T05:15:00.3721845Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting cache key-value store
2026-05-22T05:15:00.3740750Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Item key: -login.windows.net-accesstoken-***-id-https://<app-name>.azconfig.io/.default--
2026-05-22T05:15:00.3742093Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Getting cache key-value store
2026-05-22T05:15:00.3743468Z ##[debug][Fri, 22 May 2026 05:15:00 GMT] : [] : @azure/msal-node@3.8.0 : Trace - Setting cache key value store
2026-05-22T05:15:00.3744568Z ##[debug]MSAL - retrieved token - isFromCache?: false
2026-05-22T05:15:00.3767183Z ##[error]A HTTP error occurred 
Name: RestError 
Code: REQUEST_SEND_ERROR 
Status code:undefined 
Url: https://<app-name>.azconfig.io/kv?api-version=2023-10-01&key=%2Fctlplat%2Fdbaas%2Frest%2F*&label=%00 
Error message: "agent-base" has no default implementation, you must subclass and override `callback()` 
ClientRequestId: 2c534fda-ed40-4cde-affb-d0068f2b399b
2026-05-22T05:15:00.3777502Z ##[debug]Processed: ##vso[task.issue type=error;source=TaskInternal;correlationId=4e777034-c9ff-4d63-90cd-1758b2069ce4;]A HTTP error occurred 
Name: RestError 
Code: REQUEST_SEND_ERROR 
Status code:undefined 
Url: https://<app-name>.azconfig.io/kv?api-version=2023-10-01&key=%2Fctlplat%2Fdbaas%2Frest%2F*&label=%00 
Error message: "agent-base" has no default implementation, you must subclass and override `callback()` 
ClientRequestId: 2c534fda-ed40-4cde-affb-d0068f2b399b
2026-05-22T05:15:00.3779819Z ##[debug]
2026-05-22T05:15:00.3780943Z ##[debug]task result: Failed
2026-05-22T05:15:00.3782775Z ##[debug]Processed: ##vso[task.complete result=Failed;done=true;]
2026-05-22T05:15:00.3841555Z ##[section]Finishing: Gathering App Config for - TECG69CI
 </pre>
</details>

<details>
  <summary>SUCCESSFUL RUN</summary>
  <pre> Starting: Gathering App Config
==============================================================================
Task         : Azure App Configuration
Description  : Download key-values to task variables from Azure App Configuration
Version      : 6.5.0
Author       : Microsoft Corporation
Help         : https://learn.microsoft.com/azure/azure-app-configuration/pull-key-value-devops-pipeline
==============================================================================
Azure App Configuration Task is starting up...
Azure Subscription: <subscription name>
App Configuration Endpoint: https://<app-name>.azconfig.io/
Selection Mode: 'Default'
Key Filter: '/ctlplat/dbaas/rest/*'
Label Filter: (No label)
'2' key-values were retrieved from Azure App Configuration.
Finishing: Gathering App Config </pre>
</details>


### Repro steps

```yml

```

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[REGRESSION]: AzureAppConfiguration@10 unable to retrieve token. #22196

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[REGRESSION]: AzureAppConfiguration@10 unable to retrieve token. #22196

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