Which destination?: facebook_ads

Additional details: We are the engineering team at Udemy (udemy.com). 

We're using the Fivetran Facebook Ads connector and we noticed that the event column in the ad_conversion table is consistently returning NULL values.

We can confirm that conversion events are actively being received on the Facebook side — our Facebook Pixel (ID: 1457291081167286) is receiving events such as PageView, isMember, and Purchase with significant volume (e.g. 150M+ PageViews, 982K Purchases in the last ~30 days).

Expected behavior: The event column should reflect the conversion event name (e.g. Purchase, PageView, etc.)

Actual behavior: The event column is always NULL

Could you clarify:

1. Is the event column populated from the Facebook Ads API, or from the Pixel/Conversions API separately?
2. Is there a known issue or a specific API endpoint/field that maps to this column?
3. Do we need any additional permissions or API scopes enabled on our Facebook connection to populate this field?