Hi ​@TzviD, error 401 means “unauthorised”, so for whatever reason the login doesn't seem to do the job correctly…

Anyway - it looks like someone else had exactly the same problem and found a solution, check this thread on the Garmin forums:

https://forums.garmin.com/apps-software/mobile-apps-web/f/garmin-connect-mobile-andriod/234852/what-does-error-code-401-when-trying-to-connect-with-strava-routes

edit: the link doesn't seem to open the actual thread, sorry (it looks like Garmin is redirecting links for whatever reasons… ah well), this is what it says:

The Strava article https://support.strava.com/hc/en-us/articles/115000919304-Syncing-Strava-Routes-to-your-Garmin-Device could be helpful too. In case this problem is about the app “Strava Routes”: That app is not supported anymore.

None of the above seems to work for me. Tried everything

Maybe you can rephrase what the problem is, the title is a bit jumbled and we may have misunderstood what you mean.