I am trying to invite my father to my steam family but when i try to do that it says "Failed to invite to the family.". We are in the same house and same network and same store region. I have tried logging into both accounts on same device and it still didn't work. I even tried to invite my alt account which is another store region and it works just not that specific account. Any ideas how i can fix it?
(Even steam support said check FAQ and forums when asked for help)