Workload Flexible Federated Identity Credentials - Update for GitHub on supported claims

[Michiel Oda (MichielOda)]

Thanks to Zachary as the concepts page didn't explain this recent change: https://learn.microsoft.com/en-us/answers/questions/5962544/failed-to-add-federated-credential-for-github

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Michiel Oda (@MichielOda) : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

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[Regan Downer (v-regandowner)]

Kenga Derdus (@kengaderdus)

Can you review the proposed changes?

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Pull request overview

Updates the flexible federated identity credentials concepts article to reflect recent GitHub changes around supported claims and the move toward immutable subjects, so readers can configure GitHub-based credentials without running into unsupported-claim errors.

Changes:

• Adds repository_id and repository_owner_id as supported GitHub claims (with eq operator support).
• Adds a note explaining GitHub’s automatic application of the immutable format starting July 15, 2026, with a link to the migration guidance.