Rules to link a computer to a user to an asset

We use upn for user login and use SSO. Our upn and sammaccountname are different on our AD.

On fusion inventory, the computer goes up, the user also, but this one, is not linked to the user... I cannot use the part "My items of GLPI", nor the other plugins to manage correctly my park.

Can you develop a rule engine to assign the equipment to the user according to his upn.

thank you