Originally Posted by
hotturnip
I dunno, I've never flown them before. But that's not what the error message said. It said something about "No passengers on this itinerary are eligible for seat selection."
That's odd. I booked via Turkish, but I can select my seats online or by calling their call center. If you haven't already, try calling them.
Otherwise I have no idea if it's some policy related to your booking being from Priceline. As suggested, the Turkish forum here will probably be able to help you.