I had the most annoying rattle for years that sounded like it was behind the dash/drivers side air vent area.
I found it in the end
Sit in your seat with a torx 20 bit.
Look forward and upwards.
Lower the sun visor.
See if the bracket moves up n down from a loose screw.
It might be the slightest bit loose, but because its metal on metal it really rattles with the smallest movement.
I was Really satisfying to have found this rattle on mine.
It drove me crazy.
I wouldn't have ever looked up there to find the rattle. I was convinced it was the clocks or vents.