1885292Event Prioritization Required

You're trying to optimize for a conversion event on a domain that has Aggregated Event Measurement enabled, but you haven't assigned a priority ranking to this specific event. Without prioritization, Meta can't properly attribute iOS 14.5+ conversions.

What causes this error?

You’re trying to optimize for a conversion event on a domain that has Aggregated Event Measurement enabled, but you haven’t assigned a priority ranking to this specific event. Without prioritization, Meta can’t properly attribute iOS 14.5+ conversions.

How to fix it

1. Set event priority: In Events Manager > Aggregated Event Measurement, drag and drop your events into priority order.
2. Understand the impact: Only the highest-priority event triggered per user per conversion window will be reported for iOS users who opted out of tracking.
3. Re-optimize ad sets: After changing event priorities, any ad sets optimizing for affected events may need to re-enter the learning phase.