I booked a room at Aloft Anchorage on 5/25, and I checked out 5/26.
This is a brand new hotel and I stayed on the opening night. I booked the room using the Marriott Bonvoy app and there was no indication that the hotel wasn't "officially open".
The stay never got posted to my account so I submitted a missing stay request.

Here is the email I just received from Marriott:
"Your stay at the Aloft Anchorage is not a qualifying stay that can be added to your Marriott Bonvoy Account. This hotel was not officially open the night of your stay. When a brand new hotel is ready to open, they have what is called a "soft opening" not fully operational in the Marriott Bonvoy program but, open to hosts guest and give the hotel time to work out any 'bugs' before the official opening occurs. You stayed at this hotel during the "soft opening" stage of the hotel. The official opening/start date for the hotel was 5/26/2022. Because the stay occurred before 5/26, the stay cannot be posted to earn elite night credit or points since the hotel was not officially open at the time."

I'm irritated about this response since the term "soft opening" was never used when I booked the room or when I stayed at the hotel. Multiple posts on the hotel's Facebook page said that the hotel would be open on 5/25. It was never mentioned anywhere that the "official opening" of the hotel would be 5/26. No one ever said I wouldn't be receiving points or elite night credit.
Has anyone else ever experienced this?