Can't connect to multiplayer game

I have wanted to play on my friends survival world for the longest time now, but for the past year, every time I wanted to join his world, I can't seem to connect. I have done everything, reinstalled the game, delete my save files, let him reinstall the game. But I just can't join him.
However my other friends can join him. Now I have finally decided to report this bug. As I am done with having this issue.