I have experienced this three times in the last week so it seems fairly reproducible.
While the Xbox is updating a different game (e.g. Sea of Thieves) in the background, Minecraft consistently shows "unable to connect to realms". A few seconds after the other game finishes updating, Minecraft can once again connect to my realm.
During this time I can still connect to the realm with a different client (e.g. my Android phone) so it seems like an Xbox client issue.
Comments 2
Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response.
Is this still an issue in the latest version? If yes, could you please add it to the affected versions (or mention it if you are not the reporter)?
This ticket will automatically reopen when you reply.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📓 Project Summary – 📧 Suggestions – 📖 Minecraft Wiki