Venkie, did you get this to work? Often it’s the input name that spoils the party. To clarify, it’s not the “id”, it’s the “name”. Good idea to view the form source code and see if the name matches with your script.
Here’s an example of a working configuration:
css: ’ ',
Of course I created a new conversion property “last conversion location”, which generated the field “name” last_conversion_location then added the hidden field on the form.
Let me know if you still need help.