Originally Posted by
ohmark
The OP doesn't explicitly say this, but I'm assuming that when he/she checked availability of the corporate rate AFTER check-in, he/she used the MARRIOTT website, not the corporate travel site. If the corporate rate showed bookable on the Marriott site after check in, it obviously should have been available at the front desk at the time of check in. I vote front desk incompetence/stupidity as the most likely culprit, with malice/thievery, sanctioned or unsanctioned by management, a distant second.
At the time of this stay, our corporate rate was not available via the travel website (it is now). I checked both the Marriott website for the availability of the corporate rate, and also the travel website for any rates, because the FDC said the hotel was sold out (although of course since the Marriott website showed that the corporate rate was available then that would mean it wasn't really sold out as well).