WordPress Toolkit unable to retrieve administorator password from existing instance, because only hash of this password stored in WordPress instance database. But WordPress Toolkit is able to set new administrator password. In this case toolkit will remember entered password and after that automatic dashboard login feature will work properly. Could you please check errors in a browser console while trying to set new adminisotrator password? And also could you please check errors in the Plesk debug log (/var/log/plesk/panel.log) while trying? It looks like a bug but we need to investigate is this a frontent or backend issue.Removing and reinstalling WPT does not work - the login is still missing, and update password does not work after the scan. Its strange, because every other element works just fine - so there's no issue with any other element. I can't figure out what's different about these "old" installs!
plesk ext wp-toolkit --wp-cli -instance-id 199 -- user update [USERNAME] --user_pass="[PASSWORD]"