Update: Zoom has fixed the issue on their end and logging into Zoom via a web browser is now functional again.
Zoom is currently experiencing a major outage across the eastern half of the US this morning, including access to SIUE's Zoom meeting system.
Currently, after logging in, you'll experience either a message about "billing issues" or not having a "zuora account". This is a problem on Zoom's side and we're currently waiting for resolution; however, logging in and using any of the desktop clients or smartphone apps to join a meeting works without incident, though you will need to know your meeting ID.