Replacing realms doesn't work

So the realm that me and some friends decided to make is not what we wanted. We planned on importing a world that we were playing on in the past to turn it into a realm. We have done this multiple times in the past with no issue. So it is quite confusing why it no longer works. Every time I try, I get a error and so far nothing has worked. So I payed for a realm that wont actually do anything and it is very upsetting. I don't have a picture of this error on my computer to share but I'm confident that I am not the only person with this problem.