If you’re using either the Microsoft Store W10 app or the Android app, any links found in item descriptions or in a player’s profile bio won’t hyperlink. This includes both the profile preview you get when tapping a friend from your home page, and their full profile.
This issue is incredibly painful as a UGC creator, since this is how a lot of us direct players to items uploaded directly to our account, recolors, the other pieces of a matching set, collab partners, Experiences which give boosts for owning our items, and more.