I can't seem to flatten this sheet metal part out completely. I can Unbend all of the bends but one. I believe my issue is from the miter cuts and how they interact with that bend but Im not sure.
So what is my issue? Ill attach the model along with pictures of the error messages.
Yes, you are right!
You have to use Normal cutout instead of "simple" cutout!
Here is a video about this: