Within North America, Autograph Collection hotels are required to offer an amenity choice of restaurant breakfast (resorts) or a food and beverage credit (hotels). And Marriott has a cash guarantee that hotels will honor this.
The Muir Autograph Collection in Halifax, Nova Scotia, Canada says no elite breakfast, and that Marriott corporate has exempted them from the elite benefits guarantee. According to Marriott customer service there are no standards, “each hotel has its own policies and offerings.”