Originally Posted by cab747
Others have mentioned that if for any reason the name on your OnePass account and the name booked on your reservation have any slight variance (I'd imagine even a middle initial can cause a problem), the EUA tends to bypass you due to a "mismatch" between names.
I can verify this for fact. I usually go by a shortened version of my name but needed to update my OP account to match my passport post 9/11. It was a slight pain but an understandable one.