Full Answer

WooCommerce order-received pages are a common caching victim. Caching plugins like WP Rocket, W3 Total Cache, and Cloudflare can serve a cached version of the thank-you page, meaning the conversion tag either never fires or fires for visitors who did not complete checkout. Configure your caching plugin to exclude /checkout/ and /order-received/ from page caching as the first diagnostic step. For GTM-based implementations, 67% of Enhanced Conversions setups fail due to data layer timing: customer data must populate in the data layer before the conversion tag fires, and this synchronization breaks frequently on dynamic WooCommerce checkout pages with theme variations. Server-side conversion tracking eliminates this failure class entirely, since the order completion hook fires on the server with complete order data regardless of browser state or caching configuration. Google Ads diagnostics take 48-72 hours to reflect Enhanced Conversions data, so silent failures often go undetected for days.