How to get Spattie role name from construct?

Hi,

Any idea how to get the Spattie role name from the construct please?

This is not working:

    private $authorizedUser;
    private $roles;

    public function __construct(Request $request)
    {
        $this->middleware('auth');
        $this->authorizedUser = Auth::user();
        $this->roles = $this->authorizedUser->getRoleNames();
    }

I keep getting: Call to a member function getRoleNames() on null

Thanks for your help