Also this!
Mojang Status
 @MojangStatus
23 Nov 2020
The Realms issues for mobile devices has been resolved. Thanks for your patience while we rolled out a fix! - MG.
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Xbox realms are still having connection issues
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Replying to @TooOffTopic
The problem you've described sounds like a temporary issue and should have been resolved now. Please try again, and reply to this email if you're still having the same problem. ^RL

Nov 23, 2020 · 10:15 PM UTC

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Replying to @MojangSupport
I’ve spoke to a few people in regards to the same issue I’m having and got the same response. I’ll post a picture of the error message.
Replying to @MojangSupport
Is there any plan to fix the issue for Xbox?