The Regrettable Reason Why SSO Users Have To Be Forcibly Signed-out on Mobile

You probably heard that we announced a security incident earlier today. If you didn’t see the blog post, you will have seen the emails. At the same time,…

You probably heard that we announced a security incident earlier today. If you didn’t see the blog post, you will have seen the emails.

At the same time, we released Two Factor Authentication. This release was earlier than planned and it still had a few kinks (we wanted to get it out as soon as possible). Smoothing those kinks out requires some changes to our authentication system which will cause a small pain in the butts of many mobile users.

Specifically, nearly all users who

  • are using a Single Sign On (SSO) service (including Google Auth), or
  • have not (re-)signed in to Slack on their mobile device since August of last year,

…are going to be force-signed out of their teams. That means the team will just disappear and will need to be re-added (if you are signed in to more than one team, you may need to use the “Switch Teams” button, which you can find at the bottom of the right-hand menu). We sincerely apologize for this, but the alternative was an even bigger pain in the butt for a much larger number of people.

There’s more information on enabling Two Factor Authentication, including mobile, in this document on our help center. (And just a reminder, Slack’s 2FA is not available for teams using SSO, as authentication is handled by the SSO system.)

Sorry about this, and thank you for your patience.

About Slack

Slack has transformed business communication. It's the leading channel-based messaging platform, used by millions to align their teams, unify their systems, and drive their businesses forward. Only Slack offers a secure, enterprise-grade environment that can scale with the largest companies in the world. It is a new layer of the business technology stack where people can work together more effectively, connect all their other software tools and services, and find the information they need to do their best work. Slack is where work happens.