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Creating a fresh GA4 property for both Website A and Website B to use, and then adding a Config Tag in both GTM containers with a matching Measurement ID, could indeed work for your situation if you don’t want to blend data from the two sites. For Website A, the tag would be triggered by a click on an outbound link to Website B. For Website B, a Config Tag with a new data stream would be assigned to all events from page views, thus completing the cross-domain tracking setup. This gives you a setup where the domains share data streams without mixing the data from the two sites in a way that you don’t want.
