I didn't get credit for 2 recent stays. Both were prepaid, one with credit card and other with points. I didn't check-in so I don't have a receipt from the stay. Filed missing stay request for one, will soon file for the other. In email thread with Marriott I provided confirmation/receipt I got after prepay. They asked for receipt from stay so I had to explain again that I never checked in. This has taken too many messages back and forth. Perhaps one day it will be resolved.
I wonder if missing stays for prepaid but did not check in is a common problem with Marriott.