@JamesSheppardETM - Under further investigation, you actually do not have to pass in the custom geometry. In the Find Address Candidate action, you can use the auto-generated geometry output and pass it into the new record you want to create.
Old designer:
In the geometry field, click on the empty space, and then search for "geometry" in the Dynamic content pane.
New designer:
Click on the Insert expression icon. This will open the dynamic content pane.
Then, under Dynamic content, search for "geometry".