Gets stuck on connecting to multiplayer game then shows "unable to connect to world".

So me and my friend have somewhere inbetween 1.18 not been able to connect to each others worlds.Every time we try it shows connecting to multiplayer world for a few seconds then shows "unable to connect to world". We both play on playstation 4 minecraft bedrock edition. Both our games are up to date and we have tried a lot of things. My friend even redeemed his account, still nothing. Interrestingly, his cousin who plays on mobile can join his worlds. Hope this info helps.