Silly question. I've tried using an SPG50 award at 2 properties but bother are coming back saying "The promotion code you requested is invalid. The following choices are available." Am I just 0 for 2 in finding "a participating Starwood hotel or resort worldwide" or is there something special I need to do here? I'm trying to book online @ spg.com and I'm inputing "SPG50" as the promotion code.