Meta Ads - AEM campaigns (iOS) - purchase event ineligible

Question

i'm trying to launch a new AEM campaign (iOS) in Meta ads, using purchase event. For some reason, the purchase event became ineligible (it was eligible before and we have multiple campaigns running) The error we see: **Advertiser Tracking Enabled parameter volume out-of-range ** We use the purchase event coming from the MMP, not directly from FB SDK.

What can be the reason for this error and how can we solve it? We already set this FB parameter related to Advertiser Tracking Enabled and the event is still ineligible for campaigns.