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Hey there, sounds like a puzzling situation but no worries, we’ve got this figured out. Technically, these bits of data like client ID, affinity ID, and customer ID can be picked up through something like gtag.js, a Javascript tagging framework. It’s a handy little tool that can send event data directly to Google Analytics 4 (GA4), and it doesn’t need Google Tag Manager (GTM) to do so.
Also, it’s worth noting that other tag management systems (TMSes) can also send GA events without a hitch, even if GTM is being used simultaneously. And of course, it’s totally possible to submit any type of data to any endpoint through pure Javascript.
In short, even without GTM, there are several ways this type of data could be sent through to GA4. That could explain why you’re seeing that data in the pageviews of GA4. Interesting, right?
