Duplicate Lookalike user lists rejected from April 30, 2026
- Date
- Mar 19, 2026
- Effective
- Apr 30, 2026
- Regions
- Global
- Primary source
- Google Ads Developers Blog
Creating a Lookalike list with the same seed lists, expansion level and country targeting as an existing list returns DUPLICATE_LOOKALIKE in v24+ (RESOURCE_ALREADY_EXISTS in earlier versions), primarily affecting Demand Gen campaigns.
Sources
- open_in_newUpcoming changes to Lookalike user lists in the Google Ads API, starting April 30, 2026Google Ads Developers Blog · Mar 19, 2026
Related changes
Undo