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Local sandbox on Windows failed to run command with error E_NOTIMPL #3849
Description
Describe the bug
Enable local sandbox on Windows, and then try to run command, it would failed as below with error Experimental_CreateProcessInSandbox returned E_NOTIMPL.
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╰─╯╰─╯ Copilot v1.0.64-0 uses AI.
█ ▘▝ █ /experimental
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● Tip: /remote
└ Toggle remote control from GitHub web and mobile
● Sandboxing has been enabled.
❯ run dir command, if failed, give me error message
⌄ Thought for 1s
│ The user wants me to run the `dir` command. On Windows PowerShell, `dir` is an alias for `Get-ChildItem`, so it should work.
● SHELL Run dir command in home directory (sandboxed) 3 lines…
dir
● The dir command failed with the following error:
Experimental_CreateProcessInSandbox returned E_NOTIMPL.
The following velocity keys are not enabled: 61389575, 61155944.
Enable them and retry, or use schema version '0.4.0-alpha'
to fall back to the AppContainer backend.
This is a sandbox backend error — the sandbox environment couldn't create the process due to missing velocity keys. You may want to review your sandbox configuration using the /sandbox command.Affected version
v1.0.64-0
Steps to reproduce the behavior
No response
Expected behavior
No response
Additional context
No response
Activity
patniko commentedon Oct 26, 2026
Thanks for the report. Starting with Copilot CLI v1.0.71, when the newer Windows container API behind this
E_NOTIMPLerror isn't available on your Windows build, the sandbox falls back to the AppContainer-based backend instead of failing every command, and later releases include further Windows sandbox fixes. If sandboxed commands still fail on the latest version, please reopen with your Windows build number and the error message.Triaged as part of a Copilot SDK backlog review, with help from GitHub Copilot.