SymptomsWhen trying to run pre-migration Helm3CompatibilityChecker before performing migration from Helm 3 to Plesk 10, the following warning is shown:
All domains in the package are forwarding domains. (Package will not be migrated.)
CauseAll domains in the package are forwarding domains.
It is impossible to add additional domains to Plesk's subscription if its main domain is a forwarding domain. Thus, Plesk migrator chooses the domain with hosting to be the subscription's main domain. However, it can't be done if all domains in the Helm package are forwarding domains.