Subdomain is created as an additional domain in Plesk at Subscriptions > example.com > Add Domain > test.example.com
Subdomain is created at Subscriptions > example.com > Add Subdomain > test.example.com and DNS zone for a subdomain is enabled at Domains > test.example.com > DNS Settings.
DNS zones for such subdomains cannot be created/synced on Amazon via Amazon Route 53 Plesk extension. The following error is shows at Extensions > Amazon Route 53 > Mass Management
Error: Failed zone creation test.example.com.: Cannot create hosted zone with DelegationSetId DelegationSetId:N12KZABLJLJHOU as the DNSName test.example.com. conflicts with existing ones sharing the delegation set
In addition, an internal ID #EXTCERT-1209 has been created for the error displaying improvement and it is planned for future product updates.
Two hosted zones that have the same name or that have a parent/child relationship (example.com and test.example.com) can't have any common name servers.
Since this is an Amazon limitation it cannot be solved from Plesk side.
As a workaround:
- Create subdomains in Plesk only via the button Add Subdomain.
- Keep DNS for subdomains turned off.
- Manage DNS for subdomains through main domain zone at Subscriptions > example.com > DNS Settings.