Help with Material Normal Maps

I’ve created a custom normal map from diffuse for a character texture atlas using Photoshop.
I’ve simply brought that in to my Material graph , switched its type to ‘Normal’ and applied it to my Normal slot.
However the results look incorrect!
I’ve done a google image search as well and there doesn’t seem to be a consistent way to handle Normal Maps in the Material Graph.
I also need to adjust the intensity of the Normal effect.

Can anyone help?

Baking normals from diffuse rather than highpoly, without manual control, like in materialize or b2m will not give you a good result.

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