Not sure, but could it be because of this?
Thanks for your reply!
I'm not sure either. I doubt it since the game is searchable, so I don't see why they would block follow but not search. It's especially weird since the mail notification still work (as other user said)
As an user, I didn't see any option related to following someone, so I am at loss between a "miss"configuration somewhere or itch acting weirdly.