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
For help with realms connection issues on Minecraft PC/Java Edition, please visit help.minecraft.net/hc/en-us/… ^TK

Feb 1, 2021 · 2:23 PM UTC

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Replying to @MojangSupport
You have already pointed me to this page in a previous tweet, and I responded explaining that this didn't fix the issue. I'm still waiting for a response from the email I sent you. I also added my issue to bugs.mojang.com/browse/REALM…. When will this issue be fixed please?