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A step-by-step guide (docs/email-oauth.md, same shape as the API guide, whitelisted alongside it) through both vendor consoles: the Entra app registration with its three account-type choices and what each means for the tenant field, and the Google Cloud client with its consent screen, test users and the testing-status 7-day refresh-token expiry. The troubleshooting entries are errors actually hit while building this — including Graph's ErrorQuotaExceeded, whose message text hides that the mailbox may simply be full. The Sending tab links to the guide right where an admin picks an OAuth provider, via the shared links.source origin.