Google Sign In error 12500

Question

I am trying to integrate Google Sign In into my app. I don\'t have a back-end server, I am just getting the details of the logged on Google Account to my app.

I firs

Answer 1

Check if SHA-1 fingerprints are added to the firebase project settings. If not,find SHA-1 fingerprint using

https://developers.google.com/android/guides/client-auth

Also, find the SHA-1 fingerprint of release key using

keytool -list -v -keystore <keystore path>

Remove <keystore path> with the path of the key store.

Then add both SHA-1 fingerprints to firebase projects settings.

NB: Don't forget to replace google-services.json with updated google-services.json with new fingerprints. I lost two days on that.

While debug

Android studio automatically generate ~/.android/debug.keystore on first debug build and use it to sign the app.

To get the SHA-1 run (password android) (doc):

keytool -exportcert -list -v -alias androiddebugkey -keystore ~/.android/debug.keystore

This SHA-1 should be added to the app settings at firebase to allow usage of google sign in capabilities while testing debug build.

Answer 2

For me the problem was using a 'release' ClientID with my debug-configured app. Make sure you have a release and a debug keys, using each SHA-1's respectively.

Answer 3

I'm using Firebase Authentication. My SHA-1 was indicated correctly, client id was also correct but I still was getting 12500.

It turned out that my problem was that I didn't indicate Support email in my project settings. (Settings -> General tab -> Your project (Public settings) section).

Answer 4

I experienced the same problem after opening my project on another computer (different Android Studio). In my case, I solved it using the Firebase Assistant, which I had used to setup Firebase initially. Opened the Firebase Assistant (Tools > Firebase) and selecting Authentication > Connect. This reconnected the project to Firebase and updated the configs

Answer 5

The error appeared to me when the Google option was not enabled, as shown in image.

It happened when I changed Google's account and forgot to turn on the option of connecting with Google.

Answer 6

I was stuck of this for a while.

Make sure these step are performed-

• Correct SHA key is saved on Firebase Console.
• Download the latest google-service.json
• And Last and most important Save OAuth consent under credentials in google api, OAuth Screen This took a long to figure out. And it worked fine after this.