I am trying out the new Firebase/Crashlytics setup and seem to run into a weird issue.
Go to the settings of the project and add SHA-1 key for your android app. After that redownload google-service.json to your sources. This causes disappearing of this error
E/Fabric: Failed to retrieve settings from https://settings.crashlytics.com/spi/v2/platforms/android/apps/package name/settings
And after quite a huge delay you'll see crashes in Firebase Console.
By the way this doesn't help me with apps that were registered under one Google account, and after that moved to another account. Wiating for a response of Firebase team about this issue.