Tracking Conversion in Google Analytics from a Hubspot Form with Google Tag Manager
SOLVE
Hey there. We use our own Google Tag Manager tag to track all the needed GA data and inject it into the non Hubspot form hidden fields (to be still tracked by HubSpot). Thus, you only need to setup a connector (Zapier does it wrongly) to send offline events to GA. Btw, GA Client ID is by far not a single parameter you need to send to GA in order to bypass its filter as well as to send a correct IP (geo) or not a server, but a user.