I've been a Platinum member for 3 years and have run into this situation for the first time. Trying to make reservations for a few days in early December at the Santa Clara Marriott. Unable to do so on either the website or the ELite reservations phone line. The explanation provided is that the guarantee is at the discretion of the property. I havent seen this fine print anywhere and was curious if others have run into this issue and suggested course of action?