We also encountered these errors and saw issues associated with web socket connections failing to be established as well. Additional details here:
https://devforum.zoom.us/t/web-sdk-attempting-connections-to-invalid-servers-zoomsjc/89398/3
Should we expect these types of errors to trigger the ZoomMtg.join error handler? Without an error being returned, it is challenging to notify users that the connection has failed as they simply see the Zoom client attempting to load indefinitely.