I'm wondering if something is wrong with my reservations (all booked on CO.com, mainly in N/U fares) -

I have not ONCE gotten EUA since earning Silver, but am about 75-80% with upgrades on mainline flights when I use OLCI. So clearly it's not that my flights are overloaded with Plats or have no R availability. Do Silvers just not get EUA even on flights where F isn't full?