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In simpler terms, your solution lies with Google Tag Manager. All you gotta do is pass the ‘user_pseudo_id’ as a custom user parameter there, and you just need to do it once. After that, all your GA4 tags will follow the path you set. There’s a useful tutorial link in your message that explains how to do this, so give that a whirl. This should help you import the GA4 data you need into Google BigQuery.
