Without SSO setup, enable option for Admin to approve all Box accounts that sign-up with our corporate domain (e.g. @box.com).

Today, Auto Roll-In is only available via customers with SSO.

https://support.box.com/hc/en-us/articles/360043696514-Setting-Up-Single-Sign-On-SSO-for-Your-Enterprise#:~:text=Auto%20roll%2Din%20prevents%20users%20from%20creating%20free%20Box%20accounts%20using%20their%20company%E2%80%99s%20email%20address%3A