1. After changing license type some domains are missing from Plesk UI.
2. Executing of the following command returns a non-empty result:
# plesk db "SELECT * FROM domains WHERE cl_id <>1;"
3. Plesk Web Admin edition license is installed on the server.
Plesk Web Admin edition license does not allow managing customers or resellers. Only subscriptions that are owned by admin user are visible.
Upgrade the license type.
Set correct ownership for all affected domains. It can be done from the command line with the following command:
#plesk db "UPDATE domains SET cl_id = 1 WHERE name = 'example.com';"
Replace example.com with an appropriate name.