"Snap to" shortcuts don't work in 2.8/2.9 I'm really not sure what has changed in 2.8 with regard to how this menu's shortcuts are handled, but the way I had customized shortcuts for the Snap to elements in 2.79 is no longer working in recent versions. (I'm using 2.9.0)
The menu in question:

My 2.79 configuration (working):

My identical 2.9.0 configuration (not working):

The goal is to set the following shortcuts:

Alt` Snap to: Increment
Alt1 Snap to: Vertex
Alt2 Snap to: Edge
Alt3 Snap to: Face
Alt4 Snap to: volume

I placed the shortcut definitions in the same place as in 2.79: 3D View (Global)
The Python names and syntax appear not to have changed. I checked them in Blender's Console.
Also, I consulted the current Python API, but it didn't give any clues about shortcut assignment.
Note that although Alt1 through Alt0 now have Hide Collection assigned by default, disabling these does not solve the problem of my custom shortcuts not working.
I'm perplexed... any help appreciated.
We now have the possibility to snap on multiple elements (ie vertices and faces simultaneously).

So the attribute is:
tool_settings.snap_elements #With 's'

And the value is a set, ie:
{'INCREMENT'}