Does Meta Still Limit You to 8 Conversion Events for Aggregated Event Measurement?

No. Meta removed the 8-conversion-event prioritization limit for Aggregated Event Measurement (AEM) in June 2025. Before that change, advertisers had to select and manually rank up to 8 conversion events per domain, and only the highest-ranked completed event from an opted-out iOS user would get reported. As of the 2025 update, all eligible standard and custom events on a domain are aggregated automatically, with no manual event selection or ranking step required.

What AEM Was Built to Solve

Meta introduced Aggregated Event Measurement to work around the signal loss created by Apple's App Tracking Transparency framework. When an iOS user opts out of tracking, Meta can no longer receive individual event-level data tied to that person, so AEM aggregates that limited data at the domain level instead of the person level.

What the Old 8-Event System Required

Under the original AEM model, each domain was capped at 8 conversion events eligible for measurement from opted-out iOS traffic, and advertisers had to actively prioritize which 8 events mattered most — typically ranking a purchase event above a page-view event, for example — since only the single highest-priority completed event per person per day would be reported back.

What Changed in the 2025 Update

The standalone AEM configuration interface, where advertisers used to select and reorder their 8 events, has been removed entirely. Meta now automatically processes all eligible standard and custom events for a domain without requiring the manual setup step that used to be mandatory before running website conversion campaigns.

Why This Still Trips People Up

A large amount of existing guidance online — agency blog posts, old help articles, screenshots in training material — still describes the 8-event cap and the manual prioritization step as current, active requirements. That guidance is now describing a retired system, and following it (for example, trying to find the old event-prioritization screen in Events Manager) will lead to confusion since the interface it refers to no longer exists.

Bottom Line

If your team is still manually maintaining an "8-event priority list" for AEM, that workflow is obsolete — check Events Manager directly for your domain's current event setup rather than relying on older documentation describing the pre-2025 system.

Sources: Meta Business Help Center guidance summarized via industry trackers Segwise and Thread Transfer on the June 2025 Aggregated Event Measurement update, cross-referenced against Meta's original 8-event AEM documentation predating the change.