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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bugs.mojang.com/browse/REALM… Issue still unresolved. Any ETA on a fix please?
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Replying to @jenniferhaddoc2
Sorry about any delay you're encountering! We try to respond to tickets as quickly as possible in the order they were received. We appreciate your patience! ^TK

Feb 1, 2021 · 5:16 PM UTC

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Replying to @MojangSupport @jenniferhaddoc2
what’s the waiting period before having an answer
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