I checked your add-on domain and it appears that the domain was only recently changed to our name servers. When that is done, the internet servers require time to register the change. This is called propagation. I'll link an article for information, but basically, you need to give it up to 24 hours and then it should work with no problem. This is typical for a domain name server change.
Here's the article I was referring to:
What is DNS propagation?
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