The following error appears when I try to delete Plesk node:
Cannot delete the Hardware Node. There are Plesk Domain(s) hosted at this Hardware Node. You can migrate Plesk Domain(s) to another Hardware Node(s) and try again.
Existing Plesk Domain or Plesk Client subscriptions provisioned to the Plesk node which you are trying to delete.
Find the subscriptions, migrate Plesk Clients or Plesk Domains to other Plesk nodes and delete old subscriptions.
If the error remain, contact Parallels Support for troubleshooting.