Welcome to the forum @Tonia_Kendrick !
I’m not sure if we are able to help from the forum. My best guest is that it maybe is referring to a separate workspace?
Domain sounds odd language to use, as this usually refers to a web domain (like asana.com) and I don’t think this is an entity in Asana.
To better help you it would be good to know what the exact wording is that was being used.
I would advise you to contact support though, as I think they are better equipped to assist you: How to contact our Support Team ✉