Filter in slice not working

[SYawn]

Hello.  I'm creating a home inventory.  I have a table called "Rooms" with a column called "Location."  Rows in this table are things like "Basement" and "Living Room."

I have another table called Sub Locations.  This has rows with names such as "Shelf A2" and "Bin 1."  It has a column that references the "Rooms" table so that each sub location is tied to a location.

From my view of the "Rooms" table in the app, I want to be able to click on a Location (such as "basement") and navigate to a filtered list of Sub Locations in which the Location matches what the user has clicked on. 

I created a slice that I think should accomplish this:

I then created a view for this slice and an action to go to this view when a location in the "Rooms" view is clicked:

In the preview, the action appears to work correctly, however the list is never correctly filtered.  It shows the full list of sublocations.  I feel like I'm getting something very basic wrong.  Any idea what I should be doing differently?