We have done this many times while using a Marriott Vacation Club week to visit nearby National Park lodges but never another Marriott property until a few weeks ago. So I am battling with "cut and paste" CSRs to get ENCs and all points for those nights stayed per the Marriott Bonvoy Ts & Cs. I'm not asking for the two overlapped nights but it seems that CSRs either don't want to or can't make the required keystrokes.

Lesson learned. So should I go with Hyatt or Hilton for those times Marriott doesn't want me? :-)