Code 316751 Error

Hi all

I am currently playing on Xbox Series X. I have Game Pass and have Diablo 4 installed. The game has been working perfectly until doing the end of Act IV story mission with my brother. During the mission the “Reconnect to Diablo 4” message appeared in the left hand corner of the screen and shortly after it kicked me out of the game…

Upon entering back in, I have received the Code 316751 Error and cannot invite my brother to a party any longer. I have tried everything, from restarting the game, to restarting my console, to changing world tiers, to unfriending and re-adding him, to logging in on another character

Nothing is fixing it. He can invite me to a party but I keep getting the error when I try and invite him…This is extremely frustrating; it’s my first time playing a Diablo game and I’m loving it and now this error is really ruining it for me. Please advise and assist?

Kind regards

Teddy