Regen Preview Pipeline is Failing To Create PR in the .NET Repo

[jorgerangel-msft]

The git push cmd is failing due to an auth issue:

[typespec/update-http-client-1.0.0-alpha.20260519.2 fcd37c0cb] Update GeneratorVersion to 1.0.0-alpha.20260519.2 (Azure data plane)
 118 files changed, 6353 insertions(+), 1958 deletions(-)
Pushing branch to remote...
remote: Invalid username or token. Password authentication is not supported for Git operations.
fatal: Authentication failed for 'https://github.com/Azure/azure-sdk-for-net.git/'
Write-Error: /mnt/vss/_work/_temp/a13d0ae4-6b42-4e2a-99e0-6fdd60162885.ps1:3

It could be related to #10710

[github-actions]

🎯 Issue Triage

The Regen Preview Pipeline is failing to push a branch to Azure/azure-sdk-for-net due to a GitHub authentication error (Invalid username or token), preventing the PR creation step from completing.

Category: Bug
Area: eng

🔍 Analysis

• The git push call authenticates via HTTPS with a token that GitHub rejects, likely because the token is expired, lacks the required scopes, or was revoked.
• The reporter suspects a connection to PR Fix Submit-AzureSdkForNetPr.ps1 push auth for GitHub App installation tokens #10710, which may have changed how the pipeline configures or passes credentials.
• The error Password authentication is not supported for Git operations typically means the token supplied is being treated as a password rather than a PAT/app token, or the credential helper isn't properly injecting the token into the remote URL.
• No TypeSpec compiler or emitter code change is needed — this is a CI/pipeline infrastructure issue.

📝 Suggested next steps

• Check the pipeline service connection / PAT used to authenticate to Azure/azure-sdk-for-net — verify it hasn't expired or been revoked.
• Review changes introduced by PR Fix Submit-AzureSdkForNetPr.ps1 push auth for GitHub App installation tokens #10710 to see if the credential injection for the git push step was modified.
• Confirm the token has repo (or appropriate) scope on Azure/azure-sdk-for-net.
• Rotate or re-authorize the credential and re-run the pipeline.

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