Your Tozny account - create one free here
Admin access to your Slack team configuration and a Slack Plus subscription or better
About 15 minutes of time
Create a new client application by logging into your TozID realm, selecting clients from the left menu, and clicking "create" on the top right. Select Slack from the drop down menu as shown in the screenshot below.
Navigate to your organization authentication settings and enable SAML Single Sign-On. To find this setting go to your Slack admin page, select Authentication from the left menu, and select the "SAML Authentication Settings" menu button. Below is a table of the configuration settings and the corresponding values as well as a screenshot of the completed settings.
SAML 2.0 Endpoint
Identity Provider Issuer
Paste your certificate
Update profile on login
Allow users to change email
Advanced - Sign AuthnRequest