In the past, I could configure my apps comfortably via Connect App.
There have been a long way to reach the app, via Watch -> Activity & App-Management ->Activity & Apps -> My App.
Now I can only see "Deinstall" and "Show in Store". "Settings" are missing!
The App definitely worked in the past (because it´s mine, which I developed myself).
And it still works via Garmin Express.
So my conclusion: It´s a Bug in Connect Mobile for Android!