When I try to bring up my booking on Iberia.com I get the following. My booking still shows as confirmed on the OTA website.
Oops!The booking you are trying to view is no longer available for online management. If you thinks this is an error and you booked your flight on the Iberia website, please contact Customer Service. If you booked through an agency, please contact them.
I suspect that Iberia is just making sure none of us are seated next to a toilet. Hopefully they aren't stupid enough to walk back their flash sale.