You are automating a business process to execute when a coworker's laptop or phone is...

The immediate security priority after loss or theft of an authenticated device is to invalidate the compromised Slack sessions. Slack provides the Admin API method admin.users.session.reset specifically for this purpose. Current documentation states that the method wipes all valid Slack sessions on all devices for the specified user. This provides immediate containment by forcing the user to authenticate again rather than allowing a potentially unauthorized person holding the device to continue using an existing authenticated Slack session. The Audit Logs API can subsequently support investigation by identifying suspicious authentication or administrative activity, but merely monitoring events does not terminate the attacker's access. SCIM de-provisioning is too disruptive as the first response because the employee remains a legitimate member of the organization; the security problem is the compromised device/session rather than employment status. The Discovery API is intended for security/compliance integrations involving organizational content and is not the primary incident-containment mechanism. The applicable Admin API method requires the admin.users:write user-token scope and is available for Enterprise environments. Therefore, D provides the quickest and most proportionate first response. This belongs to APIs for Managing Your Slack, specifically Enterprise session administration and security incident response.