Support Questions:Why doesn't my custom domain work after updating DNS
From HasOffers
After updating DNS by specifying a CNAME for a custom tracking domain or custom application domain, you will need to wait until DNS updates propagate. It usually takes 6 to 48 hours for name servers around the world to update.
You can check the status of DNS propagation by visiting: http://www.whatsmydns.net
Input the custom domain. Results will show you where around the word have your new DNS updates. Once all locations have the updates, you can specify the custom tracking domain or custom application domain.
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