Hello everyone,
I'm facing a persistent issue when trying to register my Android app in Firebase, specifically related to the SHA-1 fingerprint. My application is built using React Native.

I recently cleaned up my Firebase console by deleting several old projects, leaving only one active project named socialapp. My intention is to add my React Native Android app to this socialapp project.

When I attempt to add an Android app to my socialapp project in the Firebase console, I consistently encounter the following error message:
Another project contains an OAuth 2.0 client that uses this same SHA-1 fingerprint and package name combination.

I understand this typically means an OAuth 2.0 client for this SHA-1 fingerprint and package name combination still exists in Google's system, likely from one of the projects I deleted (which might be in a pending deletion state for 30 days).

I have confirmed that all other Firebase projects have been deleted from my console, except for socialapp.

How can I effectively resolve the "Another project contains an OAuth 2.0 client..." error, especially if waiting 30 days for project deletion isn't feasible or if the issue persists?