When using remarketing lists in Microsoft Ads, what is the minimum list size required for the list to be eligible for ad serving?

The minimum list size required for a remarketing list to be eligible for ad serving in Microsoft Ads is 1,000 active users. Remarketing lists are collections of users who have previously interacted with your website or app, allowing you to target them with tailored ads. This minimum size ensures that the remarketing campaign can effectively target a sufficient audience and protect user privacy. If your remarketing list has fewer than 1,000 active users, your ads will not be shown to that audience. Microsoft Ads needs this minimum number to ensure that the data is anonymized and that individual users cannot be easily identified. For example, if you create a list of users who visited a specific product page, that list needs to reach 1,000 users before you can start showing ads to them. If you are struggling to reach this minimum, you may need to broaden your targeting criteria or increase traffic to your website to grow your list more quickly.