Hello FredSassen and welcome,
Apparently your FDSinc.org needs to have its Domain name records and zone file updated as shown below:
|MX||No MX record found.|
|CNAME||No CNAME record found.|
|NS||No NS record found.|
|PTR||No PTR record found.|
|SOA||No SOA record found.|
If you would like to add and register this domain name under the Comcast unbrella, please see Use your existing domain name with Comcast Business email and web hosting.
This will guide you through the process for adding your domain, but you will have to have your MX, PTR, SOA, NS records also updated. You can find your required domain name info under Manager Services.Email. View DNS Info.
Hope this helps you out.
It is a comcast domain already.
I did try to access the site via http and it says:
You have reached a domain that is pending ICANN verification.