When I see a Nintendo Switch friend in their joinable World, I try to join the player through the Nintendo Switch Friends Tab but, I receive the “Unable to connect to World” and “Connection Timed Out” messages. However, when I join the Nintendo Switch player through the Cross-Platform Friends Tab (Microsoft Account), I have no issues joining the player’s World. This has been occurring even before v.1.11.4....
Related issues
Comments

Thank you for your report!
We're tracking this issue as MCPE-34846 so I've requested this report be resolved and linked as a duplicate.
If you would like to add a vote and any new information to the main ticket it would be appreciated.
Quick Links:
Issue Guidelines – Community Support – Customer Support – Game Wiki