I called in to book a summer holiday and use the club level upgrade certificates from the credit card. The agent said that, due to technical difficulties with the merger, they were unable to attach certificates to a reservation. The workaround is to book your room and then let the hotel call in at the time of arrival to have the cert applied.

Has anyone done this successfully? I am concerned this will not work and that club-level rooms will either be unavailable or too expensive at check-in.

Thanks