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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Definitely has not been fully fixed for Switch. Not a connection or configuration issue since realms works fine on my kid's Switch. Already deleted and redownloaded the software.
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Replying to @ChairmanLong
We apologize for the inconvenience, but this is currently a known issue. The team is currently working on a fix that we hope to have out to everyone as soon as possible. Thank you for your patience while we work on the solution!

Nov 26, 2020 · 12:23 AM UTC

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Replying to @MojangSupport
When will it be fixed?