You do not control the domain

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If you are getting below error while deleting the addon domain

Error from park wrapper: Sorry, you do not control the domain

You will have to remove the add-on domain from all the files cPanel creates an entry . The files are

httpd.conf (restart the httpd service once you edit it)
named.conf and .db file from /var/named/ (restart named service)

#/var/cpanel/users/username (username is the main domains username)