i understand this. and know this wasn't my first time in his game or him in mine. but after the last update this has changed and i had hoped someone might know what i can do to get this fixed.
i have 4 different characters in different stages of the game.
1 has been to the mistlands pre-mistland update
1 never been passed the dark forest
1 never gone pass the plains
1 thats been all over the mistlands

now i went and backed up the save files then started going through each of the available versions with each of these, which took a awful long time, and got the same message after trying to join each time.
then i made a completely new character and again tried it out on all of the versions and yet still got the same message

i didn't come to the forms half hearted or unprepared. i did go the full extent of what i could on my end and the streamer even tried joining my hosted game to no avail as he had received the same message.
however this is another reason for coming here as we had someone else new to the game have no problem joining his game what so ever.

so in the end i'm still left with no answer or clue as to what i'm going do to fix this problem