[IsolationSession] Run nightly isolation-session validation on 26H1 - #1362
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Declare the isolation-session backend on the windows-prerelease-26h1 x64 and arm64 pools and add it to that platform's nightly trigger. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 00a4c931-fdc9-4c38-a5b2-63bd2196ff17
List isolation-session among the declared x64 and arm64 backends in the 26H1 row of the platform table. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 00a4c931-fdc9-4c38-a5b2-63bd2196ff17
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Copilot review overview
🟢 Approval recommended
The matrix resolves the intended two jobs, and the referenced CI validation succeeded.
Review effort: Balanced
Findings: None
What changed in this PR
Adds nightly IsolationSession validation for Windows 26H1 on x64 and ARM64.
Changes:
- Declares IsolationSession support for both 26H1 architectures.
- Adds it to the nightly plan and updates CI documentation.
| File | Description |
|---|---|
scripts/ci/validation-test-matrix.json |
Enables both 26H1 IsolationSession jobs. |
docs/ci-validation-infrastructure.md |
Documents the updated backend support. |
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Elliot (theelliotm)
approved these changes
Sep 30, 2026
Branden Bonaby (bbonaby)
approved these changes
Oct 1, 2026
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📖 Description
The nightly
windows-prerelease-26h1jobs now includeisolation-sessionon x64 and arm64. The catalog declares the backend on both 26H1 pools and adds it to the platform's nightly trigger, and the platform table indocs/ci-validation-infrastructure.mdlists it. No workflow or script changes: the test bundle, its download and the dispatcher already serve everyisolation-sessionentry.🔗 References
#1288 added the 26H1 platform without
isolation-session, since it was not yet known whether that image could run isolation sessions.🔍 Validation
A temporary workflow on this branch built the Windows binaries and ran only the 26H1
isolation-sessionjobs; it is not part of this PR. In run 36763692758, x64 passed, and arm64 passed 10 consecutive reruns after one intermittent failure. Locally, thenightlyplan gains exactly these two jobs.✅ Checklist
📋 Issue Type
Microsoft Reviewers: Open in CodeFlow