Notifiations don't work on Android once built (SDK 41)

UPDATE: I just saw this post: Unable to retrieve the FCM server key, which mentions that the command 'expo push:android:show" should check the FCM API key configured for the project. However, when I run the command, I get “Accessing credentials for kjwaller in project TrashVax
There is no FCM API key configured for this project”. I thought I had set this up properly, or am I misunderstanding something?