Facebook Ads Discrepancies Due to Conversion Windows

One of the most common reasons for data discrepancies in Facebook Ads is due to a mis-match in the conversion/attribution window settings being used for the query. If the setting for the query does not match the attribution window being shown in Facebook Ad Manager, the conversions and related values will not align.


Regarding Apple iOS 14 Changes to Attribution

IMPORTANT - As of January 19th, 2021, Facebook has made several changes to the attribution system in preparation for the Apple iOS 14 requirements. The biggest changes are the attribution windows will default to 7-day click, 1-day view in the Facebook Ad manager, and will be set for new campaigns at the ad set level rather than the account level. This may change the behavior of attribution window feature, especially if you are mixing both old and new campaigns. 


When the AppTrackingTransparency (ATT) prompt goes live, additional changes will take affect that will change or remove options from the attribution settings. For more details, see What You Need to Know for the Facebook Ads iOS 14 Changes.


We will be making adjustments and adding features and fields as necessary to make sure you can get the right attribution data from the connector. This article will be updated to reflect changes and new information to help troubleshoot issues that arise from update.



Checking What Conversion/Attribution Window is Used

To verify if this is the reason for the discrepancy, check your current conversion window settings. There's directions on where to find this setting per product here: Can I Set a Custom Conversion Window for Facebook Ads Metrics?


You can also use the new dimension called "Attribution setting" that will show what attribution setting the given object is using to compare with the Facebook Ad Manager.

Orange box highlights the "Attribution setting" dimension results, showing each setting for the campaigns


Then in the Facebook Ad Manager, you can check the "Attribution Setting" column now found under Campaigns, Ad Sets, and Ads section.


Example from Ad Set tab:

Example table from the Facebook Ad Manager showing the Ad Sets tab, with an orange box highlighting the "Attribution Setting" column



If the query setting does NOT match Ad Manager's settings as shown for the "Attribution Setting" field for that object (Account, Campaign, Ad Set, or Ad), adjust the query so that it is using the exact same conversion window type as shown, and run the query again to confirm if the discrepancy is fixed. 


Note that the default attribution window is now 7-day click, 1-day view, but the connector still uses 28-day click, 1-day view as the default. We will update this in the near future, but please check and set any attributions to the  7-day click, 1-day view to align with the Ad Manager (or whatever attribution setting is shown for the object).


Additional Information

Note as of January 19th, 2021, it is no longer possible to set the attribution at the account level. It's now set per Ad Set. The option to see the account attribution level is removed from the Ad Manager UI but you still can set the comparison windows under "Customize columns..." option.  



The attribution settings for campaigns and accounts will be calculated from the Ad Sets and for ads will be based on the Ad Set settings they are attached to. 


This means that:

  • Campaigns that completed before January 19th will have their attribution windows based on what the account setting was at the time.
  • It is assumed that queries that contain "mixed" attribution windows from older campaigns and newer ones will be calculated to the default attribution window.
  • The attribution setting for a campaign or an account is calculated based on existing ad sets. 


For historical data, you will be able to get the old default of 28-day click, 1-day view, but newer campaigns cannot use this and the longer attribution windows will eventually be retired from Facebook. They will only be available from the API for pulling historical campaign data from before this change.





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