I'm seeing a website entitled "WHAT ARE PLR MEMBERSHIP SITES AND HOW TO USE PLR PRODUCTS?" at www.addondomain.com. Perhaps this was just a propagation delay (DNS changes can take up to 48 hours to propagate across the entire Internet).
Thomas D. - GoDaddy | Community Moderator
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After performing an external DNS lookup of your domain, it does not look like it's pointing to your hosting account, which is why the site is not resolving. Here is how you find your website's nameservers, you will then want to add them to your 3rd party domain.