Conection timed out

hi I wonder if someone can help , I have tried everything including installing on serperate ps4 , for some strange reason I can not join my own brother in the same house (so we can play in full screen )but I can play matchmaking just fine , any help will be very thankful

Are you joining up as a party via PSN before launching the session, or trying to join him once he’s already in game? I’ve heard that partying up first is more reliable.

sorted it out turns out only it needed was to reset the modem