Question
Is there a minimum number of visitors required for the Retargeting Campaign to serve?
Answer
While there is no particular number of visitors required for a retargeting campaign to run (as campaign serving impressions is based on the campaign settings), we always recommend having 100 or more visitors in the audience segments added to the campaign.
To learn more about the issues with campaigns not serving, check out Campaign Not Serving Ads. You can also reach out to our Customer Support team to get your campaign reviewed.