The setting with some additional info: Although the policy came through just fine, even after a reboot, my client was not registering his PTR record…
So I used my 24/7 available free of charge consultant-helpline called google.
XX IP -.- I spammed the command mentioned above several times, I cleared Chrome's cache (read somewhere in the web, not sure if it really helps), I smashed my head against the walls but no result.
The forward DNS entries ("A" records) for windows machines on the domain are populated automatically.
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I tried to ping the domain with my laptop and it works.