Microsoft’s Slack competitor, Teams (which recently debuted on Linux as well), reportedly went down earlier today after the company forgot to renew a security certificate for the service. The company has since confirmed the unplanned outage of the service, and that they have successfully deployed a fix for it.

We’ve determined that an authentication certificate has expired causing, users to have issues using the service. We’re developing a fix to apply a new certificate to the service which will remediate impact. Further updates can be found under TM202916 in the admin center.

According to The Verge, the Redmond giant started rolling out a fix around 11:20AM, and successfully deployed it for most users by 12PM. The company also confirmed at 4:27PM eastern time that the fix was deployed.