Your clients are trying to access your class opening Zoom but they get an error message asking for a passcode.
This happens sometimes when you changed your teacher's Zoom account and your Zoom's API keys but you have already created some classes.
The classes you've created have been assigned a Zoom link and you will need to force Zoom to assign another link to the class.
To solve this problem you will need to go to your getwofh.com account with your teacher's credentials, refresh the class to force a Zoom's update.
Go to your Classes>Edit Class and Update
Go back to the dates, and set the day as it should be.
This is will force Zoom to update the classes.