Can't install application to Fenix 7s - SOLVED

Hi all,

I'm new to application development for Garmin devices. 

What I successfully did on my Macbook M1:

  - install SDK and create developer key

  - Create application using VisualStudioCode wizzard.

  - Set Language and Edit Product

  - Compile and run "HelloWorld" application using the simulator as debug version

  - Copy "HelloWorld.prg" to the GARMIN/APPS folder

Error:

  - On disconnecting the watch from USB the screen shows 2-3 seconds "Loading Maps"

  - The "Hello World" application is not visible on the watch

  - Reconnecting to the computer the PRG is no longer available in the GARMIN/APPS folder

Setup:

  - MacBook Air M1

  - Fenix 7s (latest firmware)

  - SDK 4.1.4 (not the beta)

  - AFT 1.0.12

Any idea, what I missed or why it's not working?