Hi ! I’m having a big issue with baking, also it seems the spam protection prevent me for posting a new question so I’m forced to ask it to you here.
Here is a screenshot of the problem : 
So as you can see after the baking only a mild gray thing was generated and not the full grayscale of the dirty vertex that I can see in the viewport. I did everything exactly like in the tutorial, could you please help me figure this out ?