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Shawn the major issue is that for a scatter plot, you need two CONTINUOUS (Green) measures and your Parameters are DISCRETE (blue) measures.
The typical pattern for using parameters like this is to use the parameters to allow a user to select a value, but also to create separate calculated fields that have THEIR values set by the parameters. This gives you a little more control over what you can do in Tableau.
In this case you might do something like this:
New calculated field: ROW VALUE
Formula: [Parameter 1]
New calculated field: COLUMN VALUE
Formula: [Parameter 2]
Put the new calculated fields in the appropriate spots in the viz, and make sure they are GREEN (right-click on the calculated field and select "Convert to continuous").
You'll have to play around (most likely) to get this to work.