question

I have created an item, and I have add the item to the inventory of the player to allow the player to own few characters:

     public void CreateCharacter()
     {
            
         var req = new GrantCharacterToUserRequest()
         {
             CatalogVersion = "ccc",
             CharacterName = "New Character",
             ItemId = "a739f8f7-18e0-4ee7-bdec-bd0761dc8461",
         };
            
         PlayFabClientAPI.GrantCharacterToUser(req, OnCharacterCreationSuccess, OnCharacterCreationFailure);
     }

When ever I call the function I get the error: /Client/GrantCharacterToUser: Item not owned What did I miss?