You have successfully installed an Acronis Backup Agent, but registration failed and machine does not appear in Cyber Protection console.
Or you need to re-register a client machine to another Backup Account.
There are 2 methods
Acronis Cyber Protect Cloud has introduced a new option to register/ re-register the installed Backup Agent using the installer. The registration or re-registration can be done both on the Machine where the Backup Agent is installed or on a different machine.