IMPORTANT
Hey Guys, I discovered the reason for this (apparently) issue: it’s a limitation from Facebook for security reasons introduced recently, they have deactivated the ability to see the size of a custom audience by December 22.
Indeed, you have already noticed that also in Facebook admin you see “Not available” statement, for the same reason.
This is the case where I can say: it’s not a bug, it’s a feature! ??
So, don’t worry about that, more information came out in the next days, but the custom audience should continue to work without any problem. For the moment, the size feature it’s not available and I’m going to hide with a message in the next version of the plugin to not create more confusion in us!
Here an extract of the Facebook private communication, received by email to our developers:
As noted in our advertising principles, we’re constantly looking to improve the quality and security of our advertising platforms. After identifying a technical issue with reach estimation for Custom Audiences that could potentially allow misuse of the functionality, we’re temporarily removing the ability to see audience sizes or potential reach estimates for newly created or edited Custom Audiences in Ads Manager and Power Editor, followed by the Ads API by December 22.
I mark this topic as resolved.
Thank you all.