My brother created a realm for him, me and my siblings to play together, and they have been able to access the Realm without any issues.

However aside from the first play session after launching the Realm and a short 2-3 hour session last night, I have been unable to connect to the realm. I get stuck on the "Loading Resource Packs" loading screen 9/10 times. On the occasions I am able to make it through, the game is so laggy that it takes 1-2 minutes after I mined a block for it to drop (if it does at all).

• I have tried leaving the realm and being reinvited.
• I have tested this on two systems (Xbox One and Windows 10).
• I have had my siblings try to use my Xbox on their accounts, and they have connected without any problems.
• I have tried using a different wifi network to try and join.
• I have tried joining a different realm and encountered the same issue.

This leads to believe that it must be an issue with my Microsoft account being unable to access the Realm for whatever reason.