The maximum number of users you can have accessing BigBlueButton is 100. This amount is available on the Moodle for School plans.
If you are on a Free or Starter plan, you can get more users by upgrading to a larger plan. If you require more than 100 users per session, then we recommend talking to a Moodle Partner about your requirements.
To upgrade your plan or talk to your assigned Moodle Partner, simply login to your MoodleCloud portal.