Several Plesk Domains/Plesk Clients are shown with status "Auxiliary" in Plesk Manager:
Top > Service Director > Plesk Manager > Nodes > %plesk_node% > Plesk Domains
Top > Service Director > Plesk Manager > Nodes > %plesk_node% > Plesk Clients
What does is mean?
Auxiliary Plesk Domain
Auxiliary Plesk domains are ones that exist in Plesk node and assigned to Plesk Client subscription managed by PBA-S. Auxiliary Plesk domains are managed through customer's CP under Plesk Client subscription property, they are not editable by PBA-S.
Number of domains which the customer may create for his Plesk Client subscription is configured in Billable Resource "Number of Domains" of Plesk Client hosting plan.
Auxiliary Plesk Client
During provisioning of Plesk Domain subscription to Plesk node, new domain is created in Plesk. Since Parallels Plesk Panel does not allow creating a domain without an owner, PBA-S creates new Auxiliary client first. Auxiliary Plesk client is not editable by PBA-S.