Unable to get a realm on Windows 10 or Xbox One

I have tried to get "Realms Plus" on both my Xbox one and windows 10 for the kids to play on together on their tablets, Xbox one and windows 10 PC.

Every time i try to sign up or purchase it it says that it isn't available and to try again later.

I have tried on different devices and on different internet connections, but all come back the same.

I can get a realm on the java edition but i need it on the bedrock edition for the kids to all play on together.