I just asked Sandra the front desk manager at Divi. Not all the units have a washer/dryer. The two bedroom units on the Great Bay side have them.
The casita washer dryer that was working has been moved to Building G so they have two working washer dryer units there (which I think is what they had all along).
Our original unit did have a washer dryer which was nice. But we opted to move to the Great Bay side for more peace and quiet.