This issue reported on SOLVED - [CPANEL-20535] Adding MX records to subdomains is fixed in 70.0.47.
However there are still issues when entering a domain that is a subdomain of the primary domain as an addon in the domain field.
Example:
Primary Domain: example.com
Addon Domain: subdom.example.com
Addon Subdomain: sub-subdom.example.com
Addon Directory: any
If you terminate the account it doesn't clean up the subdom.example.com DNS zone. This presents issues trying to use that domain in other ways. Removing the Addon, does properly remove the zone.
However there are still issues when entering a domain that is a subdomain of the primary domain as an addon in the domain field.
Example:
Primary Domain: example.com
Addon Domain: subdom.example.com
Addon Subdomain: sub-subdom.example.com
Addon Directory: any
If you terminate the account it doesn't clean up the subdom.example.com DNS zone. This presents issues trying to use that domain in other ways. Removing the Addon, does properly remove the zone.
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