I have a beard and I’m not understanding what everybody is talking about? But I’ll share what worked for me: I put my face (and neck area I suppose) directly facing to my bedroom light, when I did the scan, I put my phone below the direct line of sight between my head to the light while doing the scan. My face was looking more towards the ceiling than the level horizon of the room. Best I can offer, hope it ends up working for yall…
I think most like myself don't have an issue with how our faces turn out, its the clear line down the entire back of the head where one half is dark and the other half is normal skin tone. I've tried it the way you did and it still has a line down it in the back and the front of my neck looks burnt haha.