How to change settings for isp managet panel for domains to be not sensitive to rights of users?

You have domain 15.to belong to another user.

The subdomain must belong to the same user as the primary domain.

Alternatively, you can add the parameter to the /usr/local/mgr5/etc/ispmgr.conf pane configuration file.

Option InsecureDomain - indicates that when creating domains, you do not need to check the owner of the higher level domain.

Once added, the panel will need to be restarted.

/usr/local/mgr5/sbin/mgrctl -m ispmgr exit