Google Analytics may not show conversions for your Facebook campaign due to several reasons. You might not have set up conversion tracking correctly in Google Analytics. You could be missing UTM parameters in your Facebook ads, which help track traffic. You may not have linked your Google Ads and Analytics accounts properly. Your Facebook pixel might not be firing correctly on your website. You might have a delay in reporting data from Facebook to Google Analytics. In this case you need to refresh the dashboard. You could be using different tracking methods in each platform, causing discrepancies. Always double-check your setup to ensure accurate tracking and reporting.