Q: Deregister iMessage Online error.

I am getting an error when I click on the Deregister iMessage Online link: "Access Denied You don't have permission to access "http://selfsolve.apple.com/deregister-imessage/" on this server. Reference #18.6734d417.1473260726.1ebb415d"

When I go through Google I can access https://selfsolve.apple.com/deregister-imessage

But after I enter my mobile number into the box and click submit, I get an "error::forbidden."