APCurrently about 4,000 users are still facing issues.
Downdetector only tracks outages by collating status reports from a series of sources, including user-submitted errors on its platform.
Slack, an instant messaging system that many businesses have come to rely on for remote communication amid the COVID-19 pandemic, experienced widespread outages on Monday.
The company stopped releasing its daily user count after topping 12 million previous year.
The reason for the outage is unknown and it is impossible to say at this time how long the site will be down for.
Slack has been transparent about its outages in the past.
The company has apologised for the disruption: "Customers may be experiencing issues connecting and using Slack at this time".
"There's no additional information to share just yet, but we'll follow up in 30 minutes".
Now about 4,000 users are still facing issues. The cloud computing giant acquired Slack for a cool sum of $27.7 billion earlier in December. The acquisition by Salesforce will likely provide Slack some backing in its ambitious rivalry against Microsoft's Teams platform.
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