It either comes up with an error, or is continuously loading when I try to join my friend’s Switch world from my PS4. 
I successfully joined once yesterday, but ever since, I haven’t been able to rejoin.

When it continually says “Loading Server” after I click to join the world, my friend said I appear within his world and my character is there. I just have no control in the game as I am stuck on the loading screen.

please help! I paid hard earned money for this game, and need this fixed ASAP.