Me and a few of my friends are having the same issue with our realm. I hope this gets fixed ASAP.
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Replying to @SaintDeath5
Hi. Realms don't work if you're running the Beta. You will need to opt out from the beta: feedback.minecraft.net/hc/en… ^DS

Mar 26, 2019 · 8:05 AM UTC

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Replying to @MojangSupport
I've followed all of the steps and it didn't work. I never opted in to the beta testing program anyways.