Service Node in Plesk Multi Server is marked as unsupported:
CONFIG_TEXT: Status Description
The node status is Unsupported<
The node is incompatible with Plesk Multi Server.
Plesk Multi Server service node license is not valid
Unable to activate service node:
PLESK_ERROR: The node has not passed validation. Plesk Multi Server service node license is not valid
On a service node side, the following warning appears in Tools and Settings > License Management:
PLESK_WARN: The Plesk license is not compatible with the Plesk Multi Server service node
Main Plesk key that is used on a service node contains an additional license for Multi Server on the licensing server side (Key Administrator).
Outdated or missing additional license for Multi Server in Tools and Settings > Licenses Management > Additional License Keys
1. Login to the Service Node web interface
2. Go to Tools and Settings > Licenses Management > click Retrieve
or, alternatively, retrieve the license from CLI:
# plesk bin license --retrieve