Domain name is unavailable to acces (Shared IP Address)


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. (primary domain)
1) (sub-domain)
-> ( (addon-domain))

DNS look up

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?