Trying to join meeting got error code 20

@isaac2 ,

The error code you are seeing occurs because the user needs to log in to join the webinar. Below, I have included the link to the Android SDK error codes, along with a screenshot of the error you are encountering. Please review how your meeting is configured and determine if it is configured as expected.

In addition, you may find these developer forum posts helpful as well:

Please let me know if this helps!