Authorized users on credit cards are standard by most (all?) issuers of CC that I know. Only one of my credit cards (Capital One) provides me with credit cards for authorized users that have different CC account numbers. This helps me track what authorized user charged which item. For other CC I have, authorized users all have the same CC number.
Question: does anyone know what [major] credit card companies issues credit cards with different account numbers for each authorized user? Is this something that can be requested (I've not tried)?