First time baker having issues with a normal map I just baked my first normal map (by following this tutorial from Grant Abbitt). It's supposed to be a flat cable ribbon. I baked the normals from a higher poly mesh of some stitched-together cylinders. After applying the baked normal map to the low poly mesh, it looks decent in Cycles (ignore the sloppy texturing painting):

But it looks terrible in Eevee:

And, as soon as I deform the mesh in Cycles (like with a cloth sim), it immediately looks flat, like it does in Eeevee.

Can anyone help me figure out why this is happening? I'm pretty new to Blender and this is my first bake, so ELI5, if you don't mind :)
Cheers!
Apply the scale of the low-poly object and it will work fine: