Can't connect to the account "Facebook", Unable to verify account name or password
OS X 10.11.6
I'm now getting a new "Facebook Password Required" notification that takes me to Internet Accounts in System Preferences and pops up a dialog saying "Can't connect to the account "Facebook"".
When I enter my verified correct facebook password, it says "Unable to verify account name or password". My AppleID password changed fairly recently, my Facebook password has not.
One older thread for the same problem suggested deleting the Facebook internet account and re-adding it. Another suggested clicking the "Details..." button and entering the password there, but at least on OS X 10.11.6 there is no option to enter a password, the details dialog only lets me enter a name and a description for the account.
What's going on? Has anyone solved this without deleting the account and re-adding it, which I suspect may lead to a big mess with Facebook iphone synchronization.
iMac