I recently created a project and enabled Firebase Authentication SignIn method as Google providers and everything seems to working fine and I continued my project. Now at the final stage, I jus gave a try to SignIn with other email IDs but it doesn't work. On Debug, the result of the GoogleSignInResult Status{statusCode=unknown status code: 12500, resolution=null}. I tried all the options that are given in the docs. Firebase Project is created under my organisation email ID and also the Google Cloud Project as well and now, SignIn in Mobile App works only with this Organisation Email ID and not with anyone else in the same Organisation or even personal google account.
Firebase Authorised Domains is same as Google Cloud OAuth Consent Screen.
Hence, I tired to create a sample app (just to see if it working) using my personal email account in firebase and it is working with all the email IDs. I am not sure why my official or organisation account is not working just like my personal account. Please share me your thoughts on this.