Unable to log in to the Acronis Backup extension in Plesk with an existing account: The Plesk backup is not available for your account

Symptoms

• Unable to log in to the Acronis extension going to Extensions > Acronis Backup, it fails with the following error message:

  PLESK_ERROR: The Plesk backup is not available for your account. Please upgrade the account or create a new one by activating the license.

• The following error is shown in the /var/log/plesk/panel.log file:

  ERR [extension/acronis-backup] Response with error has been received. Request: {"jsonrpc":"2.0","method":"getPermissions","id":"abc012abc012"} Response: {"id":"abc012abc012","error":{"message":"Agent is not installed.","code":-32058}}

• Going to Tools & Settings > License Management > Additional Licenses > installed Acronis backup extension only allows one Plesk server registered.

• Log in to cloud.acronis.com > Devices > Acronis Backup Console contains an already disconnected Plesk server.

Cause

The Plesk server cannot be registered in Acronis because the Acronis Backup Console contains the previous Plesk server registered.

Resolution

1. Log in to Acronis Backup Console, go to Devices and delete the inactive Plesk server from the console.

2. Log in to Plesk > Extensions > Acronis Backup and register the new Plesk server with the existing Acronis account.