So this happened to my note 9 right out of the box. I had a Qualcomm quick charger from my old htc10, plugged the Samsung cord into the Qualcomm brick, and immediately charged quickly with no problems. So either Samsung's bricks are broke af, or they just really suck. This isn't much of a solution, I know, but they sell those same bricks on Amazon for those willing to spend the same amount you would for a Samsung charger for a charger that actually works.
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