This will sound daft but, I once hung one of those car park passes over the
back of the mirror (imagine a do-not-disturb kinda door handle sign thing) and it made the mirror very dark.
I notice you have a Magic Tree there, the mirror sensors appear to 'look' forwards
and rearwards to adjust the tint.
Sounds silly but worth moving that thing to see if it helps.
If you move it and nothing happens fell free to call me an idiot
