The Ultimate Guarantee doesn't apply, but the Guaranteed Room type does apply. Assuming you didn't make the reservation the same day you checked-in and that your Bonvoy elite # was in the reservation, you should receive somewhere between $25 to $100 depending on the hotel brand. Most FS brands must pay out $100 for not providing you the bed-type in your reservation. Marriott T&Cs section 4.3.c.vii
https://www.marriott.com/loyalty/terms/default.mi
Of course that doesn't preclude you from "negotiating" with the property for something different that may better satisfy both sides.