If you are encountering issues accessing Live Calls, there very well could be a Zoom update available for your computer. We recommend that you check for an update on Zoom, and also that you restart your computer.
Here is a link with information on how to update your Zoom on your computer if you need it: https://support.zoom.us/hc/en-us/articles/201362233-Upgrading-Zoom-to-the-latest-version
How to update Zoom on a mobile device:
How to update zoom from a desktop or laptop computer: