I know there have been a few questions along these lines but my case doesn't seem to fit any of those.
I have gotten as far as setting up the firebase account and can add the app and it gets analytics. But if I go to Fabric and go to the 'Link your apps to Firebase' page, the drag area does nothing as it says the app is already linked:
If I try that url with the CLIENT_ID and PROJECT_ID I get the message "Unable to find app in project . Return to Firebase Console and try again."
So is there a way to get it linked or find information about the existing link?
Problem was that there was another account linked to the app. An account that I must have made at some point, as the recovery email was one of mine, but I do not remember creating at all. Once support helped figure that out, was able to get things set up appropriately.