Domain name is unavailable to acces (Shared IP Address)

Hi

When I try to map a domain for my multisite I receive the error "Domain name is unavailable to acces". Can this be because I have a Shared IP Address? When I check the DNS of the primary and addon domain(s) the DNS are the same.

worldwhitewizards.com (primary domain)
1) wjw.worldwhitewizards.com (sub-domain)
-> (wizardjackwhiteheart.com (addon-domain))

DNS look up
wjw.worldwhitewizards.com
wizardjackwhiteheart.com

This and all the other websites are located in the public_html of the main website so I guess because the site works that the Multisite is correctlly installed. With other words they have all the same document root (cPanel). Is this correct?

When searched for a solution on the forum I have test the following tips with no result.
Set "Would you like to check domain health and propagation before mapping:" to No.

Any idea what I'm doing wrong here?

Regards,

Joris