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this is not what I requested at all. the functionality you described is what you can do FOR YOUR OWN NUMBER. As a super admin, you should have the ability to de-authorize app access FOR ANY USER IN THE ORG.
We merged these ideas together and changed the status of the idea.
Thanks for the additional feedback.
You can deauthorized app that is not assigned to any user.
1. Log in to your RingCentral online account
2. Go Phone Systems > User Phones > Device.
3. Select the instance of the softphone you want to remove, and then click Edit
4. Click Deauthorize this Computer
I hope this will help you. Thank you!