It is a common issue that the message ‘sorry the domain is already pointed to an IP address that does not appear to use DNS servers associated with this server’ appears in cpanel interface when we try to add an addon domain. The below is a screenshot of the error message which can help you to compare with the message that you are getting.

The issue can be resolved by getting into your WHM control panel and do the following steps:
- Login to the WHM
- Follow the path Home >> Server Configuration >> Tweak Settings >> Find “Allow Remote Domains” option under Domain group and turn ON it >> then SAVE.

Now try to add the addon domain again and see if the problem fixed.
Please do not forget to change the settings back in the WHM after adding the addon domain as it can cause security issues.
I hope the above can help you, thank you !