Domain name is not synchronized with PBA-S Managed name servers. The following notification is shown in DEBUG PBA-S log:
[HSPC::MT::Plesk::DNS::can_create_domain] TRACE : . -> HSPC::MT::Plesk::DNS->can_create_domain (domain => SUBDOMAIN.DOMAIN.TLD; account_no => %ACID%) => ERROR: reserved domain  [HSPC::MT::Plesk::DNS::update_domain_zone] Could not create domain SUBDOMAIN.DOMAIN.TLD
DOMAIN.TLD is reserved. The domain is listed at
Top > Service Director > Domain Manager > Setup > Reserved Domains
Delete the domain from the reserved domains list and run synchronization:
~# sudo -u apache /usr/sbin/hspc-dns-sync.pl -zone SUBDOMAIN.DOMAIN.TLD
Refer to this KB for more detail about DNS zone synchronization.