Microsoft Teams is experiencing an outage, particularly on the West Coast

Video conference app Microsoft Teams has an apparent outage on Thursday night in major cities in the US, but especially on the west coast.

The outage, which appears to have started around 4:15 p.m. PT, appears to mainly affect users Seattle, San Francisco and Los Angeles, according to DownDetector. Users on the site reported that they were unable to log into the app and could not receive calls.

Microsoft Teams is one of the more popular alternatives to the Zoom video conferencing app, with 115 million daily active users. Microsoft reported a 50% increase in user numbers in October, reflecting the industry’s tremendous growth in the past year as the coronavirus pandemic forced people to connect with colleagues, family, friends and colleagues via video chat services.

Microsoft did not immediately respond to a request for comment about the cause of the outage and when it was expected to be resolved.