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App events can take 24-72 hours to fully attribute in Ads Manager even when firing correctly in Events Manager because of Meta’s Aggregated Event Measurement (AEM) delays for mobile… check your attribution window settings match between Events Manager and campaign setup (default 7-day click), and verify Event Match Quality isn’t flagged as “poor” which causes Meta to reject conversions even though they’re firing in the SDK, because 24 hours is too early to panic but after 72 hours with zero attribution then the mapping is broken not event firing.
