I was wondering if that was you on the Intel forum with this problem?
While looking for a card to purchase, I noticed there are two versions of the 9260, or at least there appears to be. It may not be relevant but one is designated for a vPro processor and one as NO vPro.
Since I don't think your i9 processor is vPro, I will assume the part number on your card is G86C0007R610. If the card has the last 3 numbers of 510, then it is supposed to be for a vPro processor. Sorry to bother, but wanted to cover any possibilities.