"Can the $300 credit be used for a pre-paid hotel night?"

Anyone know the answer to this? I called a local Marriott to see if they sold gift cards and they said no. I know they sell them online and curious if that would trigger the credit. Guess I could try a small amount to see. Was offered the 100k upgrade but my anniversary date is literally in 5 days...so I won't be able to go to a hotel.