Users can remove permissions from Nuki App

I wanted to test out how far an user can go on managing settings and Smartlocks in the Nuki App. I received an invitation code from the main phone that manages a Nuki Smartlock. I noticed that I could delete users and permissions just by entering a 4 digit code, which could lead to a potential security breach due to the fact that it has a little number of total possible combinations (compared to other methods), and even if after five unsuccesful attempts it does not allow to enter codes temporarily, this does not last for a long period of time. Is there any way to make this safer by managing who can access the users or device settings, or by any other method?

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