myVEGAS has quietly made a few changes to the Comp Room Rewards. Now, you can only have one Comp Room Reward at a time in your wallet (My Purchases). If you try to add another Comp Room Reward, even if it is from a different MGM property, you will get this message.
You will get a similar message if you try to buy a new Comp Room Reward when you already have a reservation using a myVEGAS Comp Room Reward. (For example, if you used a myVEGAS Comp Room Reward for an April 12th stay, you will not be able to buy another Comp Room Reward until April 13th.)
They already have the limitation of only allowing one Complimentary Room Reward per trip, regardless of MGM property, but now you can’t even get another room reward until you have used (or canceled) what you have already purchased.
Also, they have moved away from the Room Reward Availability Calendars. Now you need to purchase the Comp Room Reward and log in to your Mlife account before you can see what nights are available. I have posted many of the available dates on my Room Rewards page.
They also now have specific details about combining reservations.
For a $5-15 fee you can call the MGM reward redemption line at 855.881.6074 and alter your booking reservation — for example, if you and another player are traveling together and each redeeming a room night reward and would like to merge your reservation to avoid switching rooms and/or checking in and out between nights.
On a happier note, they have added some 2 night Room Comp Rewards. Aria and Mandalay Bay both offer single Rewards good for 2 comp nights.