Do you have Master account privileges through your Zoom plan/license, and have you ensured that the Master Account option has been enabled for the account you’re requesting from?
So a potential issue is that its letting me install the app and I would expect that such a user should not be allowed to install the app in first place. Should it not prevent it from installing?
If the user in question does not have the necessary permissions on their account, they wouldn’t be able to install an account-level app. Are you testing this using your own master account?