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It sounds like you might be dealing with a timing issue. If the GA4 Configuration tag is firing before your dataLayer is populated, the variables will be undefined because the data isn’t there yet when your tag fires. To solve this, you can create a custom event trigger that precisely fires when the dataLayer population happens. You ensure this by making the custom event trigger using the same event name you’re using to push the dataLayer. Then attach this new custom event trigger to the GA4 Configuration tag. That way, the tag should only fire once the data is already in place, solving the undefined issue.
