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This kind of issue usually boils down to some kind of discrepancy between what’s happening in preview mode versus the live site. You might be running into some sort of conflict with your trigger. Check whether you’ve set your trigger to fire on all pages or just some pages. Also, it’s possible that there’s a problem with the event itself, for example, if it’s dependent on some condition that isn’t being met outside preview mode. Also, check whether there are any other tags firing at the same time that could interfere with your custom page_view tag. If none of these checks yield any issues, then you might want to use the browser’s developer tools to do a more detailed debugging, or consult with a fellow GTM expert for deeper insight.
