I am french,
and I suspect this is the problem: it is like they do not accept any longer the card that are not US. I xcomplained a lot of times, but the people that receive my e-mail help me for booking, and make the reservaitin for me, sending me back a confirmation mail, but nobody was really helpful for having my capacity of booking my-self restored.
Did anybody experienced that too?
(I lost that approx 6 months ago, my card still works with Holiday Inn, A1vis, Hertz, Delta, Air France,......)