To find the total number of engaged users in a connected TV (CTV) campaign within Display & Video 360, you should use the Reach Overlap report.
- Audience Composition report
- Floodlight report
- Inventory Availability report
- Reach Overlap report
The correct answer is: Reach Overlap report
Explanation: The Reach Overlap report in Display & Video 360 offers insights on user engagement across different dimensions, such as Country and Advertiser. It provides data on overlap, showing how many unique users have seen or clicked on ads across specified dimensions. This report also allows for the analysis of exclusive reach and duplicate reach, helping to understand the unique reach for a particular dimension, which is essential for assessing the extent of user engagement in your CTV campaign.
Read more here: https://support.google.com/displayvideo/answer/2823503