Been over 2 years since the last post of this.
With more and more people traveling I hope it helps those unaware and/or forgotten about the feature, just in case you get caught up in delays.
From the last post it seems like there was an issue with registering if you still have the blue card.
Steps:
Register your flight - Just register your card and flight details for you and up to four additional guests online, at least six hours before your scheduled departure.
Receive your pass - We'll track your flight, and if it's delayed by 2 hours or more, we'll email and SMS your pass(es) to you automatically - too easy! The minimum two-hour delay can be announced in one go, or cumulative from a series of shorter delays
Sit back and relax - Show your one-time-use code to participating airport partners and treat yourself, on us.
For information on which Lounges you can visit and further details about those lounges, visit LoungeKey™ Finder website
Is a cancellation considered to be a delay?