An Oauth2 Client Already Exists For This Package Name And Sha-1 In Another Project

I was practicing firebase CodeLab (Friendly Chat) for learning firebase with android. In that tutorials ,I made a project on firebase console named as 'Friendly Chat' and then I ad

Solution 1:

So the answer is well written in the error. You can't have two projects of same package name. Even if you delete it. It will take alteast 4-5 days to get deleted fully from developer's console.

So only solution is to generate a new SHA-1 key by custom signing the app by generating a signed apk from android studio. Or just create a new project with different package name both ways will work for now.

Hope this info helps. Do let me know if it changes anything for you.

EDIT: I encourage you to go through these official Google docs on signing apk to understand this process.