Need to delete Azure directory

innxxxx.no is an alias for the real domain name.

I need to delete Azure directory innxxxx.no from my subscription, but I am prevented to to this since this domain name is in conflict with a subscription to Microsoft Online Services. 
I created this AD for testing purposes a few months ago in corporation with the owner of domain innxxxx.no.

The company Innxxxx have now started an Microsoft Online Subscription and need to use the domain name innxxxxx.no for email routing.
This is not possible as long as my Azure AD have a directory with identical name.

It is therefore very important to remove the directory from my account.

Kindly contact me with a PM to get the real domain name