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I read before the normal map is like the basic map if you have a good normal map you are fine and all other maps depending on the normal map, is that correct?
The theory for using normal maps is you want to capture the details of higher density mesh that you want to show on a lower density mesh. So for example, details of 7 million poly sculpt on a "game resolution" of 20,000 (could be higher or lower, but usually way lower than 100,000 polys).
From what you've mentioned, you only used 1 mesh for bakes right? So really the normal map baker doesn't have any higher density source mesh to capture details from. Therefore, plain blue. You can skip baking a normal map, by unchecking the check box, and Painter would still bake the other default maps.
You can bring in another normal map later, maybe with more details baked in, to update your map bakes or texture sets.