First check if it’s a workbench or connection problem.
1) In your windows run ‘cmd’ to open a terminal
mysql -u root -p -h 127.0.0.1 -P 3306
mysql -u root -p -h > localhost -P 3306
3) If the connection is good you will get a password prompt, see if you can connect with correct password.
If your connection is denied, just grant the permission
mysql >GRANT ALL ON [DatabaseName].* TO 'root'@'127.0.0.1' IDENTIFIED BY '[PASSWORD]';
If your connection is accepted here, it’s like a workbench configuration problem.