If the hotel staff will not honor the University's sales tax exemption, go ahead and pay the bill with your p-card. Follow up with the hotel staff when you are back in the office to request that they honor the tax exemption after the fact.
Some states will not accept our sales tax exemption. Currently, the University has specific sales tax exemption certificates for Florida, Kentucky, and North Carolina. Visit the sales and use tax exemption certificates webpage to access all certificates on file.