Hello!

In case that you want to Use the Okta API to expire user passwords: https://help.okta.com/en/prod/Content/Topics/Directory/password-sync-api-expire.htm

But If you want to create a expiration date for a user account, if your users are coming from AD and imported in Okta you can set an expiration date under user account in AD.

Or you can test setting up a custom attribute called as "End Date" or "Expiration Date.

You will need to setup a custom daily job which does API calls to all active user profiles and check expiration date and send out emails where ever applicable. This can be achieved via Okta Workflows too.

But directly from the admin console we currently don't have this functionality in Okta, you can suggest an Idea in our community were are reviewed and can be voted and commented on by other members of the community, therefore making it much easier for the engineering team to understand the priorities that you have for feature requests.