Apple Internet Accounts preferences / Facebook

Hi All,

I have a couple users using Facebook that can’t use the Systems Preferences Facebook add-in with their (good and working) user ID and password. Facebook in a browser works (and they can pload pictures from there) but if they try to use the share sheet from Photos to post -it requests this account . It shows up as a verification error, but i think it’s something on the Apple side preventing authorization? Anyone run in to this this and fix it? Both users are in Big Sur and Facebook, of course, is no help.