Unable to join a Friend's world

I bought the game back in March. I think. And I've never been able to join a Friend's world or they mine. Joining a server works fine, it's specifically a join a friend's world or inviting them to mine, that is the problem. 

I have tried every known solution there is to find on the Internet. Disabling Firewall, Signing out and in, disabling my virus protection overall, trying it on a different Network, a different PC... a different CITY!!!!

I did not buy this game to not be able to play with friends online... I have also tried joining a friend who plays on mobile, switch, Playstation and PC. There is absolutely nothing I haven't tried. Is my account the problem?

 

If you need anything else to check my account, please ask. I contacted Minecraft Help and Prometheus there couldn't help me except send me some generic FAQs.