Each workplace has a cap on the total number of entities (e.g., campaigns, apps, creatives, etc.) you can create, including entities no longer in active status. See below for the full list of entities and limitations.

Entity limits per workplace

When maximum capacity has been reached

You are notified when the maximum capacity for any specific entity has been reached. If you would like to add new entities, you need to delete existing entities. We recommend deleting any inactive entities. Keep in mind that deleted entities can't be restored.