1885289 Aggregated Event Measurement Limit

Under Apple's ATT framework and Meta's Aggregated Event Measurement (AEM) protocol, each domain is limited to 8 prioritized conversion events. You're trying to optimize for an event that exceeds this 8-event cap or hasn't been configured in your event priority list.

What causes this error?

Under Apple’s ATT framework and Meta’s Aggregated Event Measurement (AEM) protocol, each domain is limited to 8 prioritized conversion events. You’re trying to optimize for an event that exceeds this 8-event cap or hasn’t been configured in your event priority list.

How to fix it

1. Configure your 8 events: Go to Events Manager > Aggregated Event Measurement. Select and prioritize exactly 8 events per domain.
2. Prioritize by value: Put your highest-value events (like Purchase) at the top of the priority list. Meta will only report the highest-priority event per user in a conversion window.
3. Verify your domain: You must complete domain verification before configuring AEM events. Go to Business Settings > Brand Safety > Domains.