As of 10:44 am Eastern Time, the company said it was investigating the issue and would follow up in 30 minutes. More than 15,000 users had initially reported issues, according to outage tracking website Downdectector. The messaging app had over 142,000 paid customers at the end of third quarter.
Currently about 4,000 users are still facing issues.
As companies around the world shift to working from home due to Covid-19 pandemic, demand for services provided by Slack and Microsoft Teams has gained traction as offices conduct meetings remotely.