The search of the user name of the first poster, vincent.richard worked all right for me, so either it was not the case 4 years ago, when he posted this, or his friend did not search on the right place. I did it on the page Connections.
If it does not work, for some reason, just append the user name to the base address in the following way:
https://connect.garmin.com/modern/profile/ + vincent.richard = https://connect.garmin.com/modern/profile/vincent.richard