I see in your video you’re using version 3.2. Version 3.3 is the latest so I recommend switching in case the issue is related to a bug.
I also noticed you switched to GPU compute. Try using CPU compute. Also, the UV winow did show an * next to the image menu, so did you follow the suggestion in the other thread so save anyway and see what you get?
That’s pretty mysterious though when it worked on a fresh file with the same version but not the other file. It might be that it was an error in the process?
(edit) I have had occasional frustrations with bake not working too, I seem to recall. But I think it was user error.