Try this work around to capture the Google Client ID when using HubSpot Meeting links.
Unfortunately for meetings the only way would be to place a landing page before the meeting link to capture the Google client ID.
The form would then have to redirect to the meeting link to select a booking.
Then ensure on the meeting form ensure these are ticked:
You might need a delay between the landing page form submit to ensure it has enough time to pre-populate the next form. But might not need this. More info here: