Originally Posted by SPN Lifer

Marriott Bonv°y will not grant an Elite Night Credit (ENC) or points for the same night at different properties.

In fact, there are numerous reports of longer stays, with an extra stay elsewhere for one night, which posts first, and prevents the ENCs from the longer stay from posting, requiring major effort to unravel.

On the other hand, one can earn points for up to three rooms at a single property, though ENCs for only one of them.

This is all explained more thoroughly in the Marriott Bonv°y Terms & Conditions (T & Cs).