CSRF Error After Move to New Server

I moved a SC Project site to a new server with basically the same platform, php version, Linux version. Apache, etc. The only thing that changed was the A record for the domain - new server, new IP.

For some reason, after the move, I cannot get logged into any account. It always throws the CSRF Token is Invalid error. I’ve tried everything, even a complete reinstall of the project and core files. Cleared cookies for the site, tried private browsing, tried several browsers, everything I know to do but I cannot turn off that error. I tried disabling it in the login app and then get the Unauthorized User message for the project, so somehow I have to figure this out and fix it. Anybody have any ideas?