u/dreamsdreams44

Hey

Running DV360 campaigns across multiple formats (Display, Demand Gen, etc.) and landing pages, and I'm seeing a massive discrepancy between DV360-reported clicks and GA4 sessions — consistently 90–95%+ fewer sessions than clicks.

Context on the mix:

• ~95% of DV360 clicks come from Demand Gen
• The gap exists across all formats and all landing pages — not isolated to one placement or creative
• Other channels (Paid Search, Meta, etc.) show normal click-to-session ratios in GA4
• The problem has been there since the beginning — not a recent regression
• Traffic is predominantly mobile
• There are no redirects between the ad click and the landing page — the final URL is called directly
• DV360 ↔ GA4 linking is configured

Has anyone dealt with a discrepancy this large specifically with DV360 + mobile? What's your debugging framework for this?

Happy to share more details if needed.