Zip Code using shortcode

Hi,
I am trying to use shortcode to insert the Zip code (postal code) into a field on a form
I can see it appear under “extra.original” and when i put in the code I get
<!– Geolocation IP Detection: Invalid property name (sub-property missing). –>
I have tried to find a way to input the sub-property but with no success.
The previous thread on this topic leads to a dead URL so that was not helpful either.
Would really appreciate your help!