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Outage in Slack

Issues with App Mentions, Grid Migrations, and Notifications

Resolved Minor
March 05, 2026 - Started 20 days ago - Lasted 1 day
Official incident page

Incident Report

Summary AI Generated

Slack experienced a 25.8-hour incident that began with delayed enterprise grid migrations and expanded to affect app mentions, mobile push notifications, and workspace administration. Users were unable to receive responses when @mentioning apps in channels, org admins experienced migration delays, and mobile push notifications failed to deliver. Slack resolved the issue by increasing processing capacity, deploying code changes to fix delayed job processing, and clearing the message backlog to restore normal platform functionality.

We're aware of an issue impacting the completion of ongoing enterprise migrations, resulting in longer than expected downtime.

In efforts to resolve the issue we're increasing processing capacity and have deployed code changes to address the delayed job processing.

We'll provide an update when we next have additional information.

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Latest Updates ( sorted recent to last )
20 days ago - at 03/06/2026 12:35AM

We are seeing improvements and working toward full resolution.Current status and actions being taken: We have cleared the message backlog and restored normal processing. Most activity has now completed, and the remaining work is progressing as expected. We will continue monitoring as the remaining scheduled activity runs. Estimated time to resolution: No ETA at this time.Scope: This issue isn't affecting any specific region, but a percentage of users may be affected.Current impact to end users: Developers may not receive responses when @mentioning an app to execute an action in a Slack channel, org admins will observe delays with upcoming/planned migrations, and mobile push notifications may not deliver.Known workarounds: No known workarounds at this time. We will provide the next update as we make further progress or if significant developments occur. 

20 days ago - at 03/05/2026 11:27PM

We're actively working to resolve the current platform functionality issues.Current status and actions being taken: Our platform is currently processing the message backlog, and we're observing improvements in our health metrics.Estimated time to resolution: No ETA at this time.Scope: This issue isn't affecting any specific region, but a percentage of users may be affected.Current impact to end users: Developers may not receive responses when @mentioning an app to execute an action in a Slack channel, org admins will observe delays with upcoming/planned migrations, and mobile push notifications may not deliver.Known workarounds: No known workarounds at this time.

We'll continue to provide updates every 60 minutes until the impact is resolved for all users.

20 days ago - at 03/05/2026 10:20PM

We're actively working to resolve the current platform functionality issues.Current status and actions being taken: We've increased resources to expedite processing and are continuing to monitor the situation. We're currently observing improved health metrics.Estimated time to resolution: No ETA at this time.Scope: This issue isn't affecting any specific region, but a percentage of users may be affected.Current impact to end users: Developers may not receive responses when @mentioning an app to execute an action in a Slack channel, org admins will observe delays with upcoming/planned migrations, and mobile push notifications may not deliver.Known workarounds: No known workarounds at this time.

We'll continue to provide updates every 60 minutes until the impact is resolved for all users.

20 days ago - at 03/05/2026 09:46PM

We're actively working to resolve the current platform functionality issues.Current status and actions being taken: Our investigation continues, and we're progressing toward a fix. Estimated time to resolution: No ETA at this time.Scope: This issue isn't affecting any specific region, but a percentage of users may be affected.Current impact to end users: Developers may not receive responses when @mentioning an app to execute an action in a Slack channel, org admins will observe delays with upcoming/planned migrations, and mobile push notifications may not deliver.Known workarounds: No known workarounds at this time.

We'll continue to provide updates every 30 minutes until the impact is resolved for all users.

20 days ago - at 03/05/2026 09:14PM

We're actively working to resolve the current platform functionality issues.Current status and actions being taken: We're currently working on a fix to block dispatch jobs while increasing resources to expedite processing.Estimated time to resolution: No ETA at this time.Scope: This issue isn't affecting any specific region, but a percentage of users may be affected.Current impact to end users: Developers may not receive responses when @mentioning an app to execute an action in a Slack channel, org admins will observe delays with upcoming/planned migrations, and mobile push notifications may not deliver.Known workarounds: No known workarounds at this time.

We'll continue to provide updates every 30 minutes until the impact is resolved for all users.

20 days ago - at 03/05/2026 08:40PM

We're actively working to resolve the current platform functionality issues.Current status and actions being taken: We’re continuing to investigate the underlying trigger and have noticed an improvement in health metrics with Push notifications.Estimated time to resolution: No ETA at this time.Scope: This issue isn't affecting any specific region, but a percentage of users may be affected.Current impact to end users: Developers may not receive responses when @mentioning an app to execute an action in a Slack channel, org admins will observe delays with upcoming/planned migrations, and mobile push notifications may not deliver.Known workarounds: No known workarounds at this time.

We'll continue to provide updates every 30 minutes until the impact is resolved for all users.

20 days ago - at 03/05/2026 08:07PM

We’re still actively investigating this issue, but we don’t have any new information to share at this time. Thanks for sticking with us as we continue to work towards a fix.We'll provide another update in 30 minutes until impact is resolved for all users.

20 days ago - at 03/05/2026 07:36PM

We've identified additional impact where developers may observe no responses when @mentioning an application. This incident extends impact to Grid migrations and iOS push notifications may not deliver.Current status and actions being taken: We continue to investigate potential triggers in recent deployments for this issue.Scope: This will impact any developers @mentioning an app in a Slack channel, upcoming/planned migrations, and iOS notifications.Current impact to end users: Developers may not receive responses when @mentioning an app to execute an action in a Slack channel, org admins will observe delays with upcoming/planned migrations, and iOS push notifications may not deliver.Known workarounds: No known workarounds.We appreciate your patience as we sort this out. We'll continue to provide updates every 30 minutes until the impact is resolved for all users.

20 days ago - at 03/05/2026 02:56PM

We're aware of an issue impacting the completion of ongoing enterprise migrations, resulting in longer than expected downtime. 

In efforts to resolve the issue we're increasing processing capacity and have deployed code changes to address the delayed job processing. 

We'll provide an update when we next have additional information. 

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