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When previewing Custom HTML tags in Google Tag Manager you’ve almost certainly run into a situation where the GTM variable shows up as a weird JavaScript method resembling something like this: google_tag_manager["GTM-ABCD123"].macro(15) And this is when you were expecting it to show the actual, resolved value! It doesn’t help that every now and then the preview mode actually shows to correct value in the preview mode. What’s up with that?

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Simo Ahava

Husband | Father | Analytics developer
simo (at) simoahava.com

Senior Data Advocate at Reaktor

Finland