Acronis Cyber Protect Cloud: Ghost backup plans on Agent after moving machine to different account

Symptoms

1. You re-registered a machine from one account to a different one following the instructions from Acronis Cyber Protect Cloud: Registering Backup Client Manually
2. You notice that this machine is running more backup plans than are applied to it (there appears to be one or more "ghost" backup plans)

Cause

In some cases re-registration leaves the backup plan applied on the server-side if the backup plan was not revoked in the Console.