If the dataset was created in your account, it is permanently deleted. If it was added from the Variable Database or shared by a supplier, it is removed from your account but the original remains available in the database.
Datasets that are in use cannot be deleted. If the dataset is assigned to any product, material, or input, the request will fail. Remove those references first, then retry the delete.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.