https://www.theguardian.com/technology/2020/aug/24/zoom-apologises-after-being-hit-by-partial-global-outage

Firm behind video-conferencing app says it has now fixed the problem, which mainly affected users in the east coast of the US and Europe

Zoom, the video-conferencing app that has proved popular with people working from home during the coronavirus pandemic, suffered a partial failure that left thousands of people in the US, UK and across the world unable to connect to work meetings or classes.