Hi John,
Which version of Firebase Unity SDK are you using now?
To be clear, you encounter the problem when play in editor, correct?
I do notice that the text on Firebase panel changed when play in editor but that should not prevent Firebase SDK from loading the config.
Also please try the following steps:
1. Remove your iOS and Android config from your project.
2. Remove google-services-desktop.json under Assets/StreamingAssets/
3. Re-add your iOS and Android config.
Shawn