I try to setup Firebase Crashlytics after done setup Firebase.
The crashes was sent successfully.
Which I can see them in firebase dashboard.
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I had the same problem.I was working in an old project with the old Fabric Crashlytics and Google Analytics
So, this are the steps I did to see the screen in Firebase of "Installation successful!"
The first 4 steps were the most important in my case. They cleaned every trace of the Fabric library that I had previously installed.