utm_source, utm_medium, utm_campaign: How GA4 Actually Reads Them ,And Why Your Traffic Ends Up “Unassigned”
Open GA4’s Traffic acquisition report on almost any account and you’ll find a channel called Unassigned quietly eating a chunk of the traffic. We’ve seen accounts where it was the third-largest “channel” — bigger than email, bigger than paid social. The team was running real campaigns with real budgets, and GA4 was shrugging at the

