Add Domain and Add subdomain buttons are missing in CP for a Plesk domain subscription.
The subscription has no hosting.
Enable Web hosting for the subscription. If web hosting is disabled in the subscription hosting plan under
Top > Billing Director > Product Manager > Hosting Plans > Hosting plan name > Plesk platform setup, please enable it in the plan first, then upgrade the subscription in question to the latest version of the plan and enable web hosting for it.
Please notr that Physical Hosting Type could be changed only to Physical hosting from other types, but not vice versa.
Limits for the Plesk domain are reached as can be checked under Top > Service Director > Plesk Manager > Domains > Plesk domain name >
Number of Domains or Number of subdomains
Buy more domains or subdomains from
CP > Account > Buy resources.