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I'd like to set-up cross domain tracking between two domains (let's say website A and website B).

  • Each website involved has its' own GTM installed and configured a bunch of custom events.
  • Each website has also own GA4 property (different once) with different data streams configured to send data to GA4 using GTM.

Official Google doc describes that before you set-up cross domain tracking in GA4, you must have the same data stream for each domain. I don't wanna mix data from two different websites in one (existing) property, so what's recommendation here? How, in this case, we should direct data to the same data stream? Should we eg. set-up new GA4 property and create config tag in both GTM containers (for website A and B) with the same Measurement ID and add this config tag only to event generating click on onbound link on domain A? How about domain B? Should we assign config tag with new data stream to all events triggered by page view?

Thanks for any recommendations and tips.

ACM
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  • Cross Domain tracking is you want to identify the same browser on two domains on **one property**. But you also said you don't want to mix the original property so it will become dead end. The 3rd property will work but you will have to set the tags for both GTM and GA4 tag all again. – darrelltw Jan 05 '23 at 15:50

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