Originally Posted by
MIKEM
...........The Marriott concierge went to the booking website of the CY Pudong and confirmed that my reservation is not guaranteed for late arrival after 6:00pm even though my reservation is secured with a credit card.........
What credit card do you have on file?

It is rare but some properties don't take Amex. If your credit card on file is Amex and property doesn't take Amex, then your reservation is not guaranteed.