PDF version of instructions is below:
When you get to the bottom part where you are asked to check the settings -
Go to Settings (Click the bottom right of screen, then click the gear at the top right).
Type "Site Settings" into the Search box and Enter
Scroll down to "Camera"
Click on "Camera" - are any sites blocked? You are primarily looking for Zoom.
Close the box and then click on "Microphone." Check for blocked sites.