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I feel like you are overthinking the whole thing. Your ‘Get Sponsor ID’ column looks correct as you have showed it above. The problem is that the url for the builder in your browser does not contain a query parameter of sponserID in the browser’s url bar. If you were on a page with sponserID in the url, then that value would be populated.

Do a favor for me. Add a text component to the screen that loads when a user opens a link shared to them by the sponsor. Point that text component to the ‘Get Sponsor ID’ column. When you open the link of the published app, you should see the ID loading in that text component.

For reference