The "forbidden by policy" error is due to Let's Encrypt blacklisting certain high-profile domains as a precaution. Have a read of this post for more information.
What changed is that you selected DNS as the challenge method in Let's Debug. In the test that failed, you selected HTTP. You can see this in the history here.
Well, Akamai won't be able to perform the DNS challenge unless you are using Akamai nameservers.
If you continue to use GoDaddy nameservers, then HTTP is the only choice you have for the challenge. That won't work because of the private IP address.
It would seem that if you want this to work, you need to use Akamai nameservers only for dopark.xyz.