You need to file a missing stay request with Marriott Rewards. Sign in to your Marriott account and look for the drop down menu in the upper right hand corner. Click 'Rewards Account Activity' and then 'View Rewards Activity'. You will be transferred to a new page, and in the upper right hand corner you will see 'Missing Stay Request'. Click there and you will see instructions on how to file your request. I beleive the wait time before you can file is 10 days - even though you know you did not use your number.