As a follow-up to my failure to exit at FRA in June with a USA passport, I returned to BER in July and was unable to use the gate to enter. My husband, who enrolled at the same time, had no issues getting through. Back to the regular queue for me. 20 minutes later, I joined him at baggage claim, and proceeded to the enrollment office at BER to follow up. After several minutes, they were able to confirm that I was enrolled in the system and had no advice for why it failed both times.
FWIW, I have the newer style USA passport with the solid plastic info page, so there is really not a lot of room for error when inserting it into the reader (it was all the way in and I was holding it down, but no luck on multiple attempts; my husband has the older style with a paper info page). I have used similar readers in several countries countless times over the years, and the only issues I have ever had in the past where when the paper page gets caught up and bends slightly at the base of the page, which is an easy fix and definitely not the issue here. And of course, no agent available to assist in either occasion, so no choice but to use the regular line. I left Schengen from BRU, so no second attempt at an exit. Needless to say, not a fan of EasyPass.