I had that problem with one of my computers. I would have to take it out and put it in many times before it would recognize it. (I'm not clever enough to do whatever it is you did) Sometimes I'd try to trick it and jam it in there quickly. Sometimes it worked. I finally realized it was a specific port that wasn't recognizing (although it would recognize others plugged in).
You are so much more 'in the know' than I am, just wanted to commiserate!
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