Zoom users around the world are unable to join meetings and video webinars using the Zoom web client and desktop app. The outage is mainly affecting users from the U.S. East Coast and the UK. Zoom has already partially restored service, with a fix currently rolling out to all impacted users. Back in April, Zoom experienced a similar outage that prevented users from joining meetings and web inars through the Zoom client and WebSDK, with the outage not affecting users joining using Zoom application.
Source: https://www.bleepingcomputer.com/news/technology/zoom-went-down-and-schools-got-a-digital-snow-day/