Here are the steps to automatically make each class room invitation unique. Once you have added the 8x8 Meetings app (see Step 1 in previous section), click on the "Settings" icon in the lower left corner of the screen:
From the Settings Menu select "Calendar & Scheduling":
In the Calendar & Scheduling page, under "Scheduling meetings" you will see a selection for "Use a different meeting for every event I schedule". Click on the circle to select that option.
Now every meeting you schedule will include a unique 3 character extension. In the example above "mathclass.xyz" - the "xyz" will be changed for each meeting invite.