Diablo is experiencing quite a few bugs:
Party Chat: party chat is not working (update, this is working in pubs but not private)
Clan Chat: not working for some still
Groups: Not allowing players to accept invites or send them out. Not allowing 4 users in a game. Receiving errors “This player is a non seasonal character” when they are.
Friends List: Displays player level at 0, displays as non seasonal when they are on seasonal characters. Displays Unknown instead of player class.
Community Chat: Says no one is in (update, this is now working)
Profiles: Not visible (update, working now for some)
Unable to Change Character: When in a party. (seems to be working for me)
Invisible Characters: Some characters are not displaying in Party Menu.
Broadcast: Not working