I fixed the site by; Deleting defender Updating the rest of the plugins (not sure this was needed) Deactivating WPMUDEV Admin Plugin Reactivate Reinstall Defender. I think maybe the problem was the admin plugin as it's menu item wasn't showing up.

The dev of this site prefers the other plugins, so I went through and deactivated the hummingbird stuff and then deactivated the hummingbird plugin altogether. When I put Defender back in, the same problem happens. So then I turned off the three other optimising plugins, and it worked; I then turned each of them on one at a time, and the problem never came back. I will ask the dev to note each setting they change from now on.

I've emailed you the login info;

Yeah, so if I remove the defender plugin, I can login; I looked at the database and that field is not there, so I can't check it. The error now says "more than 1 day" so I think it's set to 1 anyway. New ideas?

So I would love to enable this and see what we can learn, however, now I can't login to wordpress at all. I am getting; Your session has expired because it has been over 1 days since your last login. Please log back in to continue. This is after I login and enter my 2nd factor code (defender is enabled to use 2 factor).

Seems to be okay now.

Internal Server Error That didn't work; The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator at [email protected] to inform them of the time this error occurred, and the actions you performed just before this error. More information about this error may be available in the server error log. Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

https://pastebin.com/rD98N83P

https://pastebin.com/rD98N83P