We are currently testing SSO login to Box using SAML integration with our company's IdP product. We have obtained a trial license for the Business plan (valid until 3/14).

In the Admin Console → Enterprise Settings → Custom Setup tab, we attempted to set a custom subdomain name but found no field to input the subdomain.

Is it not possible to set up a custom subdomain with the Business plan?

If an upgrade is necessary to enable this feature, which plan should we switch to? Additionally, if we upgrade, will the trial's free period (until 3/14) remain unchanged?