I did as you told exactly but the same log as the above.It has been over 20 mins and there is nothing which related to update the PTR.
Let's demonstrate a typical troubleshooting scenario that you may come across with DDNS.
When integrated with AD, DNS records are just AD objects.
To successfully update, the AD computer account needs to have Modify rights to its own dns Node AD object.
We suggest waiting up to 24 hours for the DNS cache to be fully refreshed. When the DNS refreshes according to its TTL, the propagation is complete and your site will load.
You can always check where your domain is pointing by the following domain routing tool.