Oops! At the time you paired your Garmin Connect with Wikiloc, you did not activate the "Courses" permissions.
In order to send trails, go to Settings > Garmin Connect, and under the section "Send trails from Wikiloc to your Garmin GPS", unpair and pair again, making sure "Courses" is active.
Send to your GPS
Download trails from Wikiloc directly to your Garmin, Apple Watch, Suunto or COROS.