I've had mine since November. For grins I checked the online pre-approval.
Says I'm pre=approved for the Discover IT miles and the Discover IT Cash Back.
My current card is the Cash Back. I didn't bother to apply but thought I'd let you know what I saw from the pre-approval page for a card that is <1 year old.
Taking a screenshot
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Getting back to the original topic, I tried the Prequal site and was preapproved when my original Disco card was 9 or 10 months old. Didnt accept the offer tho