Why are my products only prime eligible for some buyers, and not for others?

I recently shipped 21 of my units to amazon warehouse. When I check the shipment status, it says the units are in “receiving” and that 20/21 are prime eligible. Indeed, when I (in Illinois) look up the product on amazon, it has the prime badge. But when I asked my NY friend to look up the product, he said it doesn’t have a prime badge.

So, why is my product prime eligible for me (in illinois) but not for my friend (in NY)? Is this normal? This has never happened to me. Does it have something to do with:

-the low # of units I sent in?

-the craziness of the holiday season?

-the fact that my shipment is still “receiving”?

This is bad for me, because none of my units are selling! I’m very concerned.