For what it's worth, here is the automated negative response I received for my very weak/faint hope bid 48 hours before my June cruise... (it was great despite the MoveUp fail!)
xxxxxxxxxx.,
Unfortunately, your offer to upgrade to a Sky Suite wasn't accepted. We're sure you'll have an unforgettable vacation in the stateroom you originally booked.
Summary of your offer:
SAIL DATE
SHIP
OFFER PER GUEST
Jun 06, 2023
Celebrity Apex
$1,200 CAD per person
What happens now?
Your original stateroom is unchanged, so there's nothing you need to do at this time.
Your credit card will not be charged.
We look forward to welcoming you aboard.
Celebrity Cruises