Can not login to spotify account

2 days ago I created a spotify account to us it with my garmin watch. I used my google credentials to create that account. Next I installed the Spotify app on my Fenix 6X. To connect my account, I had to go to the Garmin Connect app on my phone. When I press the "continue with google" button I get an authorisation error "disallowed user_agent". Since there is no other way to connect my Spotify account to my watch, my Premium Spotify account is now useless.

Any suggestions?