The tech firm apologized for the disruption to services and said its team is currently looking into the issue.
“We’re still investigating the ongoing connectivity issues with Slack,” the company said in an update about the outage. “All hands are on deck on our end to further investigate.”
Slack’s own system dashboard showed that problems had been logged for messaging and for connections.
Monday marked a return to work for many employees after the Christmas and New Year period, with a much higher volume than usual currently working from home due to ongoing coronavirus restrictions and using services such as Slack to coordinate with colleagues remotely.
Many affected by the outage turned to Twitter for solace.