👉 There is only one reason for the -1 when you want to profile the audience of your Facebook fan page.
The -1 is an information that Meta sends back to SOPRISM indicating that there is an impossibility to submit the audience size.
There could be several reasons why a custom audience from a Facebook fan page is not working on Meta (formerly known as Facebook). Here are a few possible reasons:
Incomplete or outdated data: If the data in your custom audience is incomplete or outdated, it may not work as expected. For example, if you're targeting people who have engaged with your Facebook fan page, but the data only goes back a few weeks, you may miss out on potential audience members who engaged with your page in the past.
Policy changes: Facebook and Meta frequently update their advertising policies, which can affect how custom audiences are created and used. If your custom audience violates any of these policies, it may not be able to be used on Meta.
Technical issues: Technical issues with the Facebook Ads Manager or Meta platform can sometimes prevent custom audiences from being created or used properly. This can be caused by anything from server issues to software bugs.
Data privacy regulations: Different countries and regions have different data privacy regulations that may impact how custom audiences are created and used. If your custom audience includes data from regions with strict data privacy laws, it may not be able to be used on Meta.
Account restrictions: Your Facebook Ads account may have restrictions that prevent you from using certain types of custom audiences. For example, if your account has been flagged for policy violations in the past, you may be restricted from using custom audiences.
In this case, the best option would be to contact the Meta Support to help you in the best way possible.