Garmin Connect (PC)
and then "Privacy"...
under "Who can see your new activity", choose "everyone" for verification purposes.
Please also ensure the activity's privacy setting is not set as private only.
Garmin Connect (Smartphone)
go top left option bar.
go Profile and Privacy
set it according to the image below.
how to get GPS Link (Smartphone)
click on "Copy to clipart", and paste it into submission form.