Slack messages disappear or fail to deliver
Slack notifications appear then vanish, or messages are not delivered at all intermittently.
Signal
Visibility
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Similar Problems
surfaced semanticallySlack fails to deliver message notifications to some users
A user reports that Slack does not send them notifications when someone sends a direct message, meaning they only discover new messages by manually checking the app.
Slack Silently Stops Delivering New Messages Until App Is Restarted
On systems that have not been restarted in several weeks, Slack silently stops receiving new messages without any error or alert. Users only discover the failure when they restart the app and see unread messages that should have arrived earlier. This silent delivery failure is a high-severity reliability issue for teams that depend on Slack for real-time communication.
Slack Mobile App Delays Real-Time Message Delivery vs Desktop
A user reports that the Slack mobile app does not display new messages in real time the way the desktop app does, creating a lag between devices. The report is a single terse complaint with no further detail on device, network conditions, or notification settings.
Slack Notifications Fail to Deliver for Some Users
A user reports Slack never delivers notifications regardless of settings changes attempted. Single-report bug with no diagnostic detail on device, OS, or notification channel.
Slack Notification Sounds and Badge Counts Silently Stop Updating on Mac
Mac users report Slack intermittently stops playing notification sounds, or the unread badge count freezes even after messages are read. The trigger is unclear, making it hard for users to trust their notification state.
Problem descriptions, scores, analysis, and solution blueprints may be updated as new community data becomes available.