NordVPN might be the issue. I disconnected NORD and it went right to the Facebook sign on page. I reconnected Nord and it I couldn't connect to the Facebook server. This is only affected so far on my iMac Desktop and MacBook Pro. iPad and iPhone are fine. I passed on my findings to Apple support. Funny….after working over 5 hours, with 3 different techs, I stumbled onto what the problem may be on my own. Hopefully this saves some of you hours of frustration. Now Nord has Nord IKE. That's kinda when the issues started. Good luck.