How to update contract owner with the api ?

Hi im trying without success to update contract owner during the creation of contract or after with the 'PUT' operation..

Ys i can attached collaborators, but i realy want this users to be the owner of the contract !

But i cant succeed to get the correct Key i think .. Is this even possible ?

I always get the : PATTERN_NOT_MATCHED Error.. as i guess some key was incorrect..

Any Helps ?

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