You are attempting to access Zoom via Canvas for an upcoming lecture. You receive an error message:

401 - v=2.0;clid=aw1;rid=INT_5016d151cd55fe54 Unauthorized Sorry, your session was expired. Please refresh the page or login again

This is a known issue with the Firefox browser and is caused by the browser's Enhanced Tracking Protection setting which prevents Zoom from validating the Canvas login credentials required to launch sessions correctly.

It is recommended that users switch to another supported web browser - Google Chrome or Microsoft Edge - when using Canvas.

Further Zoom troubleshooting steps are available here: Troubleshooting Zoom