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Outage in Slack

Trouble adding multiple users to channels

Resolved Minor
June 09, 2026 - Started about 1 month ago - Lasted 1 day
Official incident page

Incident Report

Summary AI Generated

Slack experienced a 4.9-hour incident where users encountered "multiple matches" errors when attempting to add multiple users to channels, with the system failing to properly identify team members. This issue also prevented subsequent workflows from triggering as expected. The problem was resolved after engineers identified the root cause and deployed a fix.

Some users may experience issues when attempting to add multiple users to channels. Multiple matches error may appear along with a failure to identify team members. This may cause subsequent workflows not to trigger. We're investigating and will let you know as soon as we know more.

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Latest Updates ( sorted recent to last )
about 1 month ago - at 06/10/2026 02:35PM

We've deployed a fix for the issue and are monitoring to confirm that the issue has been resolved. We'll provide another update as soon as more information becomes available.

about 1 month ago - at 06/10/2026 11:44AM

We’ve identified the cause of the issue and we’re validating a fix to ensure it fully resolves the issue before we deploy it.
We'll provide further update as soon as more information becomes available.

about 1 month ago - at 06/10/2026 10:35AM

We’re working to reproduce the issue. This will help us ‌identify the underlying cause and provide a resolution.We'll provide further update as soon as more information becomes available.

about 1 month ago - at 06/10/2026 09:47AM

We've received reports that a subset of users may continue to experience issues when attempting to add multiple users to channels using email addresses. These users may encounter a "Multiple matches" error, preventing the intended user from being identified and added to the channel.
We’re actively investigating these reports to determine whether additional remediation is required. We'll provide further updates as more information becomes available.

about 1 month ago - at 06/09/2026 08:18PM

This issue is now resolved for all users.Current status and recent actions taken: We identified the trigger for this issue and a fix was deployed. After a period of monitoring, we have concluded that there is no further impact to users.Previous impact to end users: Some users may have experienced issues when attempting to add multiple users to channels and received an error indicating a failure to identify team members. This could have caused subsequent workflows not to trigger. Required resolution steps: No further action is necessary.Thanks for sticking with us as we resolved this. We apologize for any disruptions to your day.

about 1 month ago - at 06/09/2026 05:39PM

Our work on this issue is still ongoing.Current status and actions being taken: We have identified the trigger for this issue and a fix is in the process of deploying. The progress is being monitored and we’ll provide an update as soon as the fix is completely deployed and verified.We'll be back with another update once we have news to share.

about 1 month ago - at 06/09/2026 03:24PM

Some users may experience issues when attempting to add multiple users to channels. Multiple matches error may appear along with a failure to identify team members. This may cause subsequent workflows not to trigger. We're investigating and will let you know as soon as we know more.

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