Are we 100% sure this property is an "autograph collection" branded hotel ??
When you search for all hotels in the city of Milan on the official Bonvoy website, there is no brand logo and no brand name next to this hotel, and this property is also NOT present on the official "autograph collection" website either.
See here:
https://autograph-hotels.marriott.com/locations/
It may be just that they haven't yet fully integrated it into the autograph collection portfolio, but this issue is quite important because things like free breakfast, welcome gifts, and other important Bonvoy benefits directly relate to what brand this hotel is classified as.