Fitbit OAuth Login Loop for Google-based Accounts (No Email/Password)

[SiddharthSZ]

Users who created their Fitbit account using “Continue with Google” and do not have a Fitbit email/password are unable to complete authentication in our mobile app.

During Fitbit OAuth:

1. User selects Continue with Google
2. Google account is selected successfully
3. Flow redirects back to Fitbit sign-in screen
4. Login enters an infinite loop , OAuth never completes and access tokens are not issued

Screen.Recording.2026-01-27.at.8.20.01.PM.mov

This behavior is consistent and reproducible.