Yes, phoned reservation because of mixing free-night-cert. & points...
(but free night cert. status still "unused" afterwards)
Oddly reservation details below differ from acct. activity details:

Summary of Charges
Reward Description Qty Points
PointSavers Hotel Reward: 3 Night Category 4 PointSaver 1 45,000
Hotel Reward: 2 Nights, Category 4 Hotel 1 40,000
Total points for stay: 85,000

Got Platinum Level Challenge, not Gold;
AFAICT, hotels do not need to be on any list to be Point-Saver-active, one can find Point-Saver discounts for specific hotel by putting checkmarks in "Pay with Points" & "My Nights are Flexible" boxes; MEX-Reforma had Point-Saver nights, especially 1 month out.