I went ahead and cancel my realm for now since it’s un-playable. It’s sad to see them not take this issue serious. I payed for a usable product not a broken one. Won’t go back until it’s fixed if that. I went and started own server for now with no issues. I really hope they fix it.
It happened to me as well.
I am running my own server at home and the Xbox will see it locally. Try it, it’s only outside your home where you have to make changes to your setting on each device. I downloaded my world and it’s all good now.