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Then again I use Forge so I can't help you in the workflowt. I apologize.
BUT I think you are missing something essential here. That's not how sketching inpainting works!
Is not you paint a black mask and that's it, you have to sketch some random bullshit to give it "depth" the ai can interpretate into something.
Then you get the result and send it to inpaint and inpaint again.
Of course your image only gives some black stuff, thats what you are telling the ai you want
Step by step, black base, then add some shadows or lines or something and inpaint, then get that result send it to inpainting and inpaint that result again