Don't know what else to offer if you have tried it the few different ways I mentioned. Did you check the owners manual to see if they offer some other way of doing it? Some people have a hard time with it, and I sort of think some cars are harder to do than others.
If there is a dealer nearby maybe you could ask if one of the techs would try resetting it? The dealers aren't ALL bad.
It's a case where I wish the car was here in my driveway so I could try it.

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