You will earn a lower reward if you chose to receive Hotels.com Reward Nights. Make sure you complete your booking without signing into the Hotels.com site as this will automatically add Reward Nights.
No rewards are given on flights or non US/CA bookings or when use a voucher code (including codes by Hotels.com) or a gift voucher to make the booking. All rewards are applied to the hotel cost, minus taxes and fees. Rewards will not be approved until 90-120 days after you have completed your stay. Multiple bookings for the same hotel stay will not be rewarded nor when bookings are deemed to be not genuine personal customers' bookings. If any changes are made to your booking (i.e. changing of the hotel, room upgrade or amending the date of the stay) it may cause the rewards to be invalid.
Queries can only be investigated after your booking (stay) is complete.