I am booked on a flight tomorrow, which has been showing R8/RN2 for the past 4 days straight (all 4 days of the EUA window). And yet I have not been upgraded, nor has the R/RN count gone down, nor have any other seats been assigned on the seat map. So it looks like no one else has been upgraded either.

Does EUA sometimes just not run at all for 4 days straight? Or is it supposed to run once a day at least?