Hello, I have encountered some difficulties in tracking the users' signing up newsletter by Google Tag Manager. Here are the steps I take: Step_1: I created the user's signing-up newsletter form via Constant Contact. Looks like 👇 Step_2: I was trying to track the successful submission behavior by Google Tag Manager. (Submit by clicking 'Subscribe') Step_3: However, this form is an iframe provided by Constant Contact, which cannot be detected by Google Tag Manager. So, is there any way I can track this form submission by Google Tag Manager? Thanks!!!!!
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