Identify Widget 3.4.2 - Layer not found in the map

I wiped out all of the default services that were provided as a sample with the widget. I entered a REST url for a service within a Dynamic Map Service and clicked browse. The widget recognized the REST URL and allowed me to customize the fields. I added settings and reverted to the interface to add more, and noticed the yellow triangle stating that the "Layer not found in the map".

I've used the same REST URLs with the Enhanced Search Widget and they work fine, there are no issues. Any ideas?

Thanks,
Scott