Title says itall
If you have a recent firmware them you won't need to Komoot app to syc stuff anymore, best deleted. It may be this that's causing the problems.
In case you don't know about the updates then this links to DC Rainmakers explanation of how to sync Kamoot, Strava routes and other directly.
https://www.dcrainmaker.com/2020/05/garmin-launches-strava-komoot-route-sync-works-on-devices-a-decade-old.html
