Hey!
We have just (finally) migrated to Firebase, but we're struggling to fully integrate all services (AdMob, Analytics, Google Play, etc).
Right now our issue is with "Add Fingerprint" for some of our games. Currently the SHA1 key is empty and there is a SHA256 key already automatically filled during import/first integration.
When I press "Add Fingerprint" and type the SHA1 key, it errors me out with the message: "An error occurred when attempting to modify an Android certificate fingerprint. Please try again later.". I've been trying this since yesterday so it's not a temporary glitch.
If I debug the network connection when trying to add the SHA1 key, the server response is "ALREADY_EXISTS" (error code 409). But it doesnt exist, the SHA1 list is empty (and when I go to "Account Linking" tab and then Google Play it doesnt link, saying there was no match with SHA1 key), and if I type a random SHA1 code it accepts and adds it, so the problem is with this specific SHA1 key (the correct key).
This happens only with a specific app. With another app I managed to add its SHA1 key successfully, and with a third app it had already imported the SHA1 key somehow.
Am I missing something, or is it a server side bug?
Thanks!