To send data from Campaign Manager to Display & Video 360, what initial step should be taken?
Associate the Display & Video 360 partner ID in Campaign Manager’s Properties
Remove any reference to Campaign Manager Site(s) in Display & Video’s Basic Details
Associate Display & Video 360 in the advertiser’s Floodlight configuration in Campaign Manager
Associate the Bid Manager partner ID in the advertier’s “Creatives fields” section
The Campaign Manager Floodlight Configuration ID is the unique ID representing the same advertiser in Campaign Manager. This is used to sync Floodlight activities from Campaign Manager to Display & Video 360 as first-party audience lists.
Read more here: https://support.google.com/displayvideo/answer/3423704