Hello,
I have this list that links a departement ('Title') to a person ('Référent') :

In power apps, a first dropdown ask for user to select his departement :

And I would like for a second dropdown to propose the corresponding persons ('Référent').

However, this formula doesn't show anything in y drop down. I think it is beacause of the type of the column (person or group) so I need to use something like Office365.Users ?
Thanks, Max