Hey there! We are keeping an eye on this and will let you know when the fix is in!
Mojang Status
 @MojangStatus
8 Dec 2020
We are aware that some players are having issues joining Realms right now. We’ll let you know when this is resolved!
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Replying to @urdadlol209
If you think you've found a bug, please visit bugs.mojang.com/secure/Dashb… and report it so that the developers can see. ^RL

Dec 8, 2020 · 7:24 PM UTC