This seems to be an issue with cPanel trying to check on the web-server itself as the authorative name servers. When in fact e-mail servers will really be checking the real authorative name servers for your domain which are ns1/2.webhostinghub.com.
I went ahead and created a test e-mail account, and then using an online DKIM testing tool, I sent a test message to ensure that DKIM headers were getting properly checked, and it came back successful:
If you're having any issues at all accessing any sections of cPanel now, other than the Email Authentication section which will load slow due to the way it's checking the domain's name servers, then please let us know.
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