Originally Posted by Aloomatar

I certainly appreciate the work you've done James, thank you!

It's just frustrating to try to use GPUs (mostly EU to US and back) several times and never have them clear.

Currently I'm trying to book flights 2 months out (I've actually been looking at this since 3+ months out) and have seen no R availability for instant upgrades at all.

Another poster said this is availability from LHR a few days/weeks out so maybe I just need to waitlist and hope.

The flights from DUB almost *always* travel full on all classes, so I wouldn't be surprised if United just didn't want to open up upgrade space. It's pretty much guaranteed to sell here.
And I think that's why the frustration exists.