Having same issue on my 2013 28i.
What I noticed was that the side mirrors do dim but the light has to be very intense, that is only high beams from another car. In pitch dark shining a flashlight works too. Like a previous post said, if this can be fixed with coding, that will be good. It does work but only when the light is very bright, which should not be the case and dim consistently with the rearview mirror.
Going to take this to the dealership soon to get it figured out
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