BTW, I tried the following things based on old posts in the forum about similar login issues, but these steps didn’t help. The issue remains unresolved.
1. Logged out using https://www.mydomainname.com/wp-login.php?loggedout=true
2. cleared cookies and restarted browser
3. using FTP, moved plugins directory to a temp directory and created new plugins directory
4. tried logging in – didn’t work
5. reverted plugins directory and still didn’t work
Any other ideas? I know it’s a holiday weekend in the U.S., but I’m getting desperate! ??