Hi Marc,
Can you provide a screenshot to better illustrate the issue you are having?
There's a handful of fields that get created in the output of the Reverse Geocode tool, including "REV_Street", "REV_City", etc. (if you turn off option to display field aliases). Are you saying the only field that gets returned with meaningful values is "REV_Match_addr" and every other field created by the Reverse Geocode tool (REV_*) has null values in it?
You state the locator was created in ArcGIS Pro, but based on the fact that you're using it in ArcMap as well, I assume you built it with the Create Address Locator tool, and not the newer Create Locator tool. Would you be willing to test building a new locator with the Create Locator tool and see if the behavior is better?
Create Locator—Help | ArcGIS Desktop
-Eric