Trying to book an award flight...
Went from:
Sorry, there seems to be a technical problem. Please try again in a few minutes, and please contact us if it still doesn't work. x3 times
to:
It looks like you're using multiple tabs on the same browser
to:
Sorry, we are unable to process your transaction using this payment card

(Bank doesn't show any pending transaction nor fraud alerts so I know its not my card)

Sigh