Sign-in was cancelled or denied
Social login callback had no code (user cancelled Google/Facebook/etc., or the provider denied access). Redirect uses oauth_cancelled.
Why this happens
Member closed the consent screen, clicked Deny, or the provider returned an error without a code. Not a site misconfiguration (that is usually “provider not configured” / failed exchange).
Diagnose and fix
1. Start social sign-in again and approve the requested permissions.
2. Or use email and password instead.
3. If consent always fails, check provider app status and OAuth redirect URI.
4. Distinct from Invalid or expired sign-in session — try again (state/cookie).