Downloaded the 1.19 update on my Nintendo Switch. Created a new world on my realm. After a few minutes of the "Joining Realm..." screen, I get an error and a message saying "Unable to connect to realm. Failed attempting to join realm. Please try again later." Tried a different world, same issue. Tried creating the world outside the realm, then uploading - same issue. Tried turning off the console and restarting the game - same issue. I have no problems opening newly created worlds outside the realm.

Steps to reproduce: (from MrRagnark)

1. Join to a Realm in a device in the latest version that is not a Switch to update the Realm to 1.19.0
2. Join the Same Realm in a Nintendo Switch

Observed Results:
The Switch player will be in a long period of waiting, after some minutes it will say "An error ocurred trying to join the Realm.”

Expected Results:
Switch players should be able to join the Realm.

Additional Information
Reporter in MCPE-156750 states that if another player is already in the realm they are able to join using Nintendo Switch.