How to find Unmanaged users who have email addresses from my domain

Hello.

the solution offered did not solve my problem in Box live chat (Case #3222610).
so, I contacted again.

the solution offered is below
https://support.box.com/hc/en-us/articles/4415011447443-User-Details-Report

in user details reports, the available values for the User Type are "Managed" and "External".
I can not select "Unmanaged" and "All".

I want to know how to find unmanaged users who have email addresses from my organization's domain
what should I do ?

and 
if unmanaged users are used as Shadow IT, I want to delete those users.
what should I do ?

please give me some solutions.