Tracking iframed content via a Google Tag Manager container on the parent page, can be notoriously difficult. Not because of Google Tag Manager, mind you, but because iframes is The Devil’s Work™️.
Luckily there’s a solution, when trying to tie Hubspot’s Meetings Scheduler form and your tracking tool of choice together, and your best friend here is the standard window.postMessage method, which can solve the problem for you.
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