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.
Advanced Filters
Filter by time of year or recording date. Find trails only from people you are following.