We use the custom audience API to build a suppression list (to avoid advertising to all of our members). On a regular basis we upload the list with all of our members to the same audience (for example look at audience id=sijs). However, while our member list is only ~ 70 millions the dashboard reports the audience size of 81.3 M ! Is this an error in the reporting side of things or does the advertiser API store duplicates?
Any updates on this?