Trying to add a mapped subdomain to ManagedWP. The ManageWP SEO option can't check rankings on the mapped domain.
The Managed WP support team replied:
Since this is the case, you should configure your domain mapping plugin and enable the 1.Remote Login option and 4.Redirect administration pages to the networks original domain.
If your domain mapping plugin doesn't have these options you should use this one and then the website should be connected successfully.