Unique Viewers represents the estimated number of unique Teads IDs exposed to the ad.
Unique Viewers metric has a specific behavior: it is compatible with only specific dimensions and metrics.
In order to generate a report with this metric (either through TAM Reporting Tab or API), please make sure that you are selecting compatible dimensions and metrics along with it.
Dimension or Metric
Campaign external integration code
Creative external integration code
Creative portfolio item
Line item billable event
Line item budget
Line Item ID
Line item name
Line item targeting mode
Video completion rate