The error message you’re seeing usually occurs if social login is enabled on AppMySite but authentication login has not been enabled in Google Firebase. To resolve this, please follow these steps:
In the left-hand menu, click on Build > Authentication.
Navigate to the Sign-in method tab.
Enable the authentication providers you need (e.g., Google, Facebook, Apple, etc.).
Save the changes.
Once you have enabled authentication, please download the updated Firebase configuration file (google-services.json), upload it on AppMySite, and then try to rebuild your app.
If you continue to face any issues, feel free to reach out.