Web hook for single sign on

Hi Team,
I am trying to capture single sign on event (“user.authentication.sso”) using Okta’s event web hook mechanism and deliver that to my custom endpoint for auditing purpose. But, I couldn’t find and appropriate user event related to single sign on in User auth events. Any help is appreciated. Thanks.

Not all events are eligible for web hooks at the moment - https://developer.okta.com/docs/reference/api/event-types/?q=event-hook-eligible