Problem with adding site in ".online" domain

Hi

In the dashboard i cannot add site in “.online” domain.

A message appears (for a properly registered i configured) domain, for example:
*****.online is not a registered domain

How to add this type of domain?

Regards

Please use the search. That error has been covered extensively.

I added a .online domain two weeks ago, so I know it works just like any other domain here.