Background Noise During Session

Thank you for responding.  I did a test with just one person  today and they did not enter their PIN and you are correct.  I could mute her.  But, we had a very large number on the previous  training and the phone symbol for some was not green or accessible but was greyed out.  We believe those were our "problem children."  We sent them a PIN but still could not get them so we could mute them.  On a previous training we actually asked a couple of people to disconnect because they were unable to figure out how to enter their pin or believed they had entered it but we could not see that we had access to mute their phone.    On my test today, when my test attendee was unmuted we  had horrible echoing like we did during our training session.  Once she was muted it was clear.