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. 

The Slack Engineering team is currently investigating severe latency impacting all Slack services. We'll provide an update as soon as we have more information to share and apologize for any inconvenience this is causing.