Thursday January 27, 2022


Some customers are unable to receive 2FA SMS messages

Issue summary:
On January 27, 2022 from 5:30 a.m. to 1:06 p.m. PST, some users may not have received 2FA SMS messages for signing in to Slack.

This was traced back to an upstream provider that was experiencing issues with a hardware configuration. The upstream provider resolved the problem, and affected users began receiving 2FA SMS messages once again.

7:57 PM PST

The issue for users not receiving their 2FA SMS codes has now been resolved. If you continue to experience any trouble, please reach out to us at

3:00 PM PST

Some customers are unable to receive 2FA (two-factor authentication) SMS messages. This is due to an issue experienced by one of our upstream partners. We are investigating further and will share back when we have more updates.

7:13 AM PST

Services affected