I was attempting to book an AF reward flight, but kept getting a "Sorry, something went wrong..." error page, after confirming my flight, personal, and payment information. Very frustrating. Tried multiple times, even changing the itinerary slightly. Also spent over an hour on hold with Flying Blue, only to have the line disconnected.

Finally, switched my region on the website (top right of page) from "United States - EN" to "Australia - EN" and went through the award booking flow again and had it ticket, no problem! Hope this helps.