Cannot add friends or join guild

I'm playing on Xbox, and I can't add anyone to my friends. Whenever someone adds me, I show up in their list, but I can't add them back, and I receive no notifications. I also can't join a guild because I can't receive invites. I've been through every single setting in the game and on my console, and nothing has fixed it.

Have you found a solution yet? My friend on Xbox is having that problem when he tries to play with me, I'm on steam.