SSL error when viewed from 1 location

We have a client that is seeing SSL errors when viewing their website from within their own network. This includes when employees VPN into the network and attempt to load the site. Any ideas we could offer them to troubleshoot internally would be appreciated!

The website is

The error messages include:
Chrome: Your connection is not private - NET:ERR_CERT_COMMON_NAME_INVALID
IE: There is a problem with this website’s security certificate

They are probably using split brain DNS and have a DNS entry for the server which points ot it’s true origin IP and not the Cloudflare IP.

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