I used this code in Hong Kong Hyatt Regency Tsim Sha Tsui last in 2014 April for 10 night using this code:
90010 LI & FUNG TRADING CO (Tommy Hills) Philips Van Heus
It was $800 HKD off the lowest posted rate. However no upgrade due to corporate rate. Excellent location and hotel facilities. My daily rate was only $1600 HKD. They never asked for my ID. My suggestion is change you Hyatt Gold account profile and add whatever company name you want to use.