Incident: Trouble with Slack - General Slack functionality issues

Timeline

1. 28 May · 15:22 UTC 🟡 Resolved rss

   This issue is now resolved for all users.Current status and recent actions taken: We deployed a series of configuration adjustments and infrastructure fixes to restore services. Messaging, Workflows, Apps, and Connections were progressively restored over the last several hours. Some users continued to experience permissions-related issues, including inability to manage channels and Canvas edits not saving, as a result of residual stale cache data. Cache deployment activities completed at 14:13 UTC on May 28, 2026, fully resolving the issue. Scope: This issue affected Slack users globally.Previous impact to end users: Slack users experienced difficulties accessing Slack features, including Messaging, Workflows, Apps, Integrations, APIs, Canvas, and Connections, beginning at 22:21 UTC on May 27, 2026. Following an infrastructure change, a cascading scheduling failure caused widespread service impact across all regions and clients. Slack services largely returned to normal operational levels at 05:45 UTC on May 27, with residual impact that remained during the deployment. A brief issue with Canvas surfaced at 10:00 UTC on May 28‌ that lasted until approximately 12:30 UTC.  Required resolution steps: No steps required.We apologize for any disruptions to your day. We'll undertake a full investigation of the incident, establishing the technical trigger, the mechanism of failure, and preventative measures to avoid further disruptions. 

2. 28 May · 15:22 UTC 🟡 Resolved rss

   This issue is now resolved for all users.Current status and recent actions taken: We deployed a series of configuration adjustments and infrastructure fixes to restore services. Messaging, Workflows, Apps, and Connections were progressively restored over the last several hours. Some users continued to experience permissions-related issues, including inability to manage channels and Canvas edits not saving, as a result of residual stale cache data. Cache deployment activities completed at 14:13 UTC on May 28, 2026, fully resolving the issue. Scope: This issue affected Slack users globally.Previous impact to end users: Slack users experienced difficulties accessing Slack features, including Messaging, Workflows, Apps, Integrations, APIs, Canvas, and Connections, beginning at 22:21 UTC on May 27, 2026. Following an infrastructure change, a cascading scheduling failure caused widespread service impact across all regions and clients. Slack services largely returned to normal operational levels at 05:45 UTC on May 27, with residual impact that remained during the deployment. A brief issue with Canvas surfaced at 10:00 UTC on May 28‌ that lasted until approximately 12:30 UTC.  Required resolution steps: No steps required.We apologize for any disruptions to your day. We'll undertake a full investigation of the incident, establishing the technical trigger, the mechanism of failure, and preventative measures to avoid further disruptions.