Domains used by PA subscriptions are down. There are no DNS records in their zones under
Top > Service Director > Domain Manager > Domains > domain.tld
Zones were removed from PA for some reason. Please check if the domains have A record in their zones.
Restore zones from PA and wait until theey are propagated to OBAS. There is a periodic task Update DNS for POA nodes under
Top > Configuration Director > Logging and Errors > Action Log > Tasks queue tab that can be launched to speed up DNS synchronization between PA and OBAS.