Wednesday August 29 - Saturday August 24, 2019


Some workspaces having issues with upstream two factor authentication service

Technical Summary:
On August 29th, 2018 at 08:02 AM PT we internally detected problems logging into Slack using Duo Mobile for two factor authentication. We reported the issue to Duo and Duo was able to resolve this for users. We called an all-clear at 8:31 AM PT. Slack users should be able to sign into their accounts once again. If you’re still having trouble signing in with two-factor authentication, please reach out to us at

7:56 PM PST

Trouble with the upstream two factor authentication service has been resolved. All teams are now able to log in once again. Thanks for your patience with this.

8:31 AM PST

Some workspaces are having problems logging in with their upstream two factor authentication service. We're keeping an active eye on this issue until a solution has been found. Apologies about the interruption to your day.

8:02 AM PST