\DBMS\MySql\mysql.exe"' is not recognized as an internal or external command - ALL Backups on various computers are failing with this error as of yesterday

Hi,
We have installed v12.1.2 and afraid that there are still problems even though we have confirmed the existence of the mysql.exe.

We are receiving the following emails:
Subject: The MySQL Server connection on [SERVER] is offline as 01/01/2019 12:42:54
Body: The computer itself is online, but the SQLBackupAndFTP service connection on this computer receives no communication from the MySQL Server [IP]:3306 . This means that the MySQL Server has stopped, restarting or the login used by SQLBackupAndFTP service running on this server has changed. The MySQL Server backups from SQLBackupAndFTP will not run until the communication is restored.

On running the “Test Connection” feature, the following error is usually (but not always) displayed: