Two issues which can cause login to not work correctly when you are using Firebase Configuration.
- Incorrect firebase project location : Firebase configuration will not work if your firebase project is located in South Asia or newer regions. We recommend using US / Europe based regions.
- Incorrect firebase configuration : Missing Realtime database in firebase configuration. If you copy firebase configuration before enabling realtime database then it will cause issues. After enabling disabling firebase features, make sure you re-copy firebase configuration and paste in vibebp settings.