I just booked a multi city ticket TATL in Comfort Y. Went to go eUp but when I checked it’s saying PY is 9 credits and waitlisted. I’ve had tickets in Flex Y that have only cost me 8 credits to eUp to PY in the past on the same length of flight. Why is it charging me more credits to eUp to Y when I booked a more expensive fare? Is it worth it to just cancel my booking and rebook in Flex or is there some way to get a different Comfort Y fare that is in a higher eUp bracket?

Thanks in advance!