Domain Mapping: cannot connect well established domain

Hello.

I have not been able to successfully use the Domain Mapping plugin following the instructions on the plugin page.

I've also read and followed instructions found on WPMUDEV's The Ultimate Guide to Domain Mapping with WordPress and Multisite article.

But still no luck.

How can I resolve this problem?

NOTE #1: Rather than allow support access, I prefer to learn how to follow instructions for troubleshooting this issue so I won't have to write the same question when I try to map another domain.

NOTE #2: I've done a lot of reading already so please don't send me to another Support Page where I have to decipher each person's answer :slight_smile: