Welcome to Centrify.
To clarify here. Your installation isn't failing; what's failing is the system checks. You can easily run "dpkg -i centrify-package.deb" and the installation will succeed.
Keep in mind that you have flexibility. I personally don't use DM, but I'd recommend that you run the adcheck command locally in the system. Your screenshots just show the error and the sites and services, but you don't specify the IP address/subnet of the target host.
Bottom-line:
Run adcheck in the system and provide the output. Also show the actual subnet of the system to see if it's really accounted for or not.
Alternatively, just ignore the error and join AD. Our client is smart enough to figure out a path as long as your DNS is configured correctly.
sudo dpkg -i (centrify-package).deb
sudo adjoin -w -c "ou=your,ou=container" -u your-user -V domain.name
R.P