Cannot create alias in icloud mail

I have icloud+ and I have tried to create an alias to my icloud email. I have read your guides on how to do this but it does not work. I just get a message saying it cant be created right now and to try again.

I have tried this both on my Iphone in Safari and in chrome on my PC. I have tried on different wifi´s, i have tried to log out from icloud and back in again. I have checked that the icloud servers are working and still not working.