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Tracking HubSpot Forms on COS Pages in Google Analytics
We used this article to set up tracking in GTM for all form submissions on our HubSpot pages. It worked for a couple days and then stopped. There were no updates to our forms, pages or GTM/analytics during that time period. We've explored several different avenues, but still can't pinpoint what the issue could be.
I'm not aware of any changes made, but like that article specifies the event was undocumented. In general, undocumented functionality isn't guaranteed to be stable, and may change or be deprecated at any time without notice.
Going forward, I'd recommend updating your event listener to use the publicly documented global form events: