Domain mapping just shows the load screen?

I posted this previously but the issue has not been resolved. I have followed all the instructions contained in the usage documentation

I have set up a dedicated IP for my network and have created an A record on the site I wish to join to my network. However, when I attempt to map the domain all I get is the loading symbol which does not go away.

here is the link to the original post

I have provided images in the previous post. Can someone please help me resolve this issue.