If you are using an audience that you have created in Properti to use with a campaign, the audience estimate might display NaN to NaN, or -1.
Privacy Thresholds: For privacy reasons, Meta (Facebook) often withholds specific data for audiences which can include the audience size or potential reach. Facebook does not publicly disclose the exact threshold within the campaign setup as it hasn't performed a data match to retrieve an accurate representation of the audience via the API.
If you are using an uploaded customer list (CRM, custom contact list), you will know the size of this audience based on the count of contacts you are uploading. Within the platform, the audience size isn't going to display a number, rather NaN to NaN or -1 as Properti adhere to these same advertising and privacy policies.
As long as your customer list matches a sufficient number of Facebook users, the campaign will perform effectively.
💡 To get the most out of your advertising efforts, you have the option to add location based targeting as well as using a custom audience within a single campaign.