When I try to migrate subscription from Plesk Control panel to PPA, I got the following error:
PPA does not support hosting subscriptions owned by resellers. All hosting subscriptions can be owned only by a customer
Login to Plesk as administrator and change subscriber for subscription from reseller to client:
Plesk Control Panel->Subscription, choose subscription and click on "change subscriber"
Migrate subscription again
PPA does not allow to create subscription under reseller. It is necessary to move subscription to client.