Zoho tells me the domain name is already registered.

Zoho tells me the domain name is already registered.

We have a website with the domain name skaneland.org. My co-worker was going to create an Zoho email linked to the domain name. His secretary deleted the email he received from Zoho. Now he does not know the email and the password. He created this new Zoho email instead. When I try to link this new Zoho email to the domain name it says: "This Domain is not supported or is already registered with Zoho". I think the domain name is probably registered with the old old Zoho email. What can we do?