On a cPanel server if you get the error: Error from park wrapper: domain.com is already configured while adding an add-on domain under cPanel. Make sure to remove the domain.com entries from:

/var/cpanel/users/username  remove (dd) related entries to domain,
vim /etc/named.conf   remove (dd) related entries to domain
remove dns entry in whm
run /scripts/updateuserdomains
(Renaming or commenting will not help; you will have to remove the entries completely.)

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