I noticed a lot of comments about this on our feed. ^JP
Mojang Status
 @MojangStatus
23 Sep 2019
Realms: We’re currently investigating an outage causing joins on both Bedrock and Java to fail. Thank you for your patience. - BS
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Isn’t fixed yet been an hour
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Replying to @BigMattyy
I'm sorry for the trouble. We're looking into it and we should have an update soon.

Sep 23, 2019 · 11:18 PM UTC
This tweet is unavailable
The problem you've described sounds like a temporary issue (help.mojang.com/customer/por…). Please try again later. ^km
1
This tweet is unavailable
The problem you've described sounds like a temporary issue (help.mojang.com/customer/por…). Please try again later. ^SK