Add Deactivated User to Groups

Using the Okta User Interface applications how do I add a deactivated user to groups. We only want to activate users after they are members of various groups.

We do not want to have to build a whole enterprise API workflow processing systems to do this for some users sometimes. Our organisation requires we go through protracted security and architectural reviews before allow implementation of any API integration with external applications.
As preparation for this we would prefer to do this fairly basic task, configuring users with groups before activating their account, using the Okta User Interface that has been designed and built by Okta’s talented UX experts.

Can you please add this feature to the UI so we can demonstrate that Okta is a good product for deeper adoption and can justify the effort to integrate with our enterprise bus integration system.