lasagna 1a0588d233 fix: auto-retry Microsoft OAuth on AADSTS650051 race condition (#18405)
## Summary

Fixes #13008

Azure AD has a [known
bug](https://learn.microsoft.com/en-us/answers/questions/5570899/our-adminconsent-url-always-fails-with-aadsts65005)
where the first consent attempt for a multi-tenant app fails with
`AADSTS650051` because the service principal is mid-provisioning in the
target tenant. Microsoft's own engineers have acknowledged the issue
with no fix ETA.

This PR adds a transparent retry to the `MicrosoftOAuthGuard`:

1. When the OAuth redirect returns `AADSTS650051`, the guard parses the
`state` parameter to recover the original query params (workspaceId,
invite hash, locale, etc.)
2. Redirects the user back to `/auth/microsoft` with a `msRetry=1`
counter
3. The full OAuth flow restarts — by this point the service principal
has finished provisioning, so consent succeeds
4. Capped at 1 retry (`MAX_MICROSOFT_AUTH_RETRIES`) to prevent infinite
loops. If it still fails, falls through to the normal error page

From the user's perspective, they just see a brief extra redirect
instead of a cryptic error page.

### Context

- `AADSTS650051` is a race condition in Azure AD's service principal
provisioning during multi-tenant app consent
- It's distinct from missing consent (`AADSTS65001`) or admin consent
required (`AADSTS90094`)
- The error is transient — retrying the same flow immediately succeeds
- Microsoft Q&A threads confirm this affects many multi-tenant apps, not
just Twenty

### References

- [Microsoft Q&A: adminconsent always fails with AADSTS650051 on first
attempt](https://learn.microsoft.com/en-us/answers/questions/5570899/our-adminconsent-url-always-fails-with-aadsts65005)
- [Microsoft Q&A: AADSTS650051 for multiple
applications](https://learn.microsoft.com/en-us/answers/questions/5571098/when-customers-attempt-to-sign-in-and-grant-consen)

## Test plan

- [ ] Deploy to a staging environment with Microsoft OAuth enabled
- [ ] Have a user from a new Azure AD tenant attempt Microsoft sign-in
for the first time
- [ ] If AADSTS650051 occurs, verify the user is transparently retried
and signs in successfully
- [ ] Verify `msRetry` counter prevents infinite redirect loops (check
server logs for the warn message)
- [ ] Verify normal Microsoft sign-in flow (no error) is unaffected

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: neo773 <62795688+neo773@users.noreply.github.com>
Co-authored-by: neo773 <neo773@protonmail.com>
2026-03-22 16:51:10 +01:00
2025-08-07 17:02:12 +02:00
2025-07-08 15:13:02 +02:00
2026-03-11 16:30:28 +01:00

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