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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I'm sorry to hear that. For help with account issues, please visit help.mojang.com/customer/en/… ^RH

Oct 8, 2019 · 7:13 PM UTC
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We try to respond as soon as possible. We do apologize for the inconvenience and thank you for your patience as we work through our backlog. ^PT