New courses not syncing from Garmin Express or Strava to Fenix 5x

How did you try it?

Your watch should be connected via Bluetooth with your Phone. Then select a course in the Garmin Connect app and send it to the watch. Wait until the BT sync is finished. Then the course appears on your watch.
I  just checked it with my Fenix 5 plus, because I have not done this with the latest firmware, and it works perfectly. I cannot test it on a Fenix 5x and this is the forum for the PLUS versions.
I had a Fenix 3 before and there it always worked and I used it very often.
I do not use Strava Routes because I always draw my own courses (inspired by courses I find anywhere) and mostly I use the app Locus Maps (Android) for that purpose.