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Form submissions and Google Tag Manager

I’ve got a few forms across my site and the client would like to have goals set for form completion. I’ve tried setting up GTM using ‘event’ and the form trigger with the form IDs but it doesn’t seem to be working? The tags don’t fire at all. On another group someone suggested changing the trigger type to “Custom Event” and using Click ID/Class ID of the submit form button instead. Where do I get the click ID?

Can anyone help? I’m pretty new to this. I’ve had a look here but didn’t really get it

Here’s my link

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

No solutions? Can someone at Webflow weigh in on this?
I have clients that ask about this feature…