Baking normals

I have been trying to bake normal from a high poly mesh to a retop, but where I have unwrapped the mesh it is just alpha after baking

looks like the rays aren’t making it? Clipping issues, ray distance, selecting the wrong things, having them in different places (they need to occupy the same world space), or maybe even inverted normals on your target mesh. There are too many variables to identify exactly what you need to fix from so little information.