Failure to join the creator and guests to the realm also can not download or change the world

Since yesterday at 3 pm I had problems with the login and I was worried that they would try all kinds of recommended methods on the official and unofficial pages more than once and twice also not only can I not join the kingdom, but also my guests this problem does not cover only one device since I play on iPhones 12 pro max two of my friends on iPhones 7 and 8 and others on Android as well as consoles like Nintendo so I don't know what to do and I'm worried about losing my kingdom so I want to know what problem is it the problem and how to solve it and not lose the world in realm since it cannot be restarted or changed or downloaded