Adding UTM Parameters to a URL

I have a Contact Us form (embedded from Hubspot) that appears after a user has already interacted with a Google Maps API to give their location. I do not want the user to have to input that data a second time, but need the info to route the lead. The solution is to use UTM parameters in the url extension itself. However in Experience Manager I am getting an error message when trying to add the UTM string. Any thoughts on how to address or troubleshoot? Getting the same error whether I am adding a new page or editing properties of an existing one. Thanks!

Quite simply, you cannot add a query string here. the last element is just the last path element of the url. If you need to add url parameters, it will have to be done on the java component level.

Thank you for the response!