Hey there! We are keeping an eye on this and will let you know when the fix is in!
Mojang Status
 @MojangStatus
8 Dec 2020
We are aware that some players are having issues joining Realms right now. We’ll let you know when this is resolved!
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Hey, there is not only problems with joining. With creation too. I payed to resume my suspended bedrock realm 2 days ago & it's not running yet. WTF guys I want to play. (Case №1593858)
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Replying to @alexxgrib
To keep your information secure, please complete our request form at help.minecraft.net/hc/en-us/… so we can quickly and safely assist with your question! ^TK

Jan 4, 2021 · 3:56 PM UTC

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Replying to @MojangSupport
I did it 3 days ago. I received a "case id" from your email stating that you are "currently receiving a large number of tickets". Please, do something, 3 days passed, realm is down. My bank even fully passed this international transaction