When the account was started, I generated a code and created a customized passcode, and have been using that since to have meetings.  I later realized I should have used my PMID in order to have the same meeting.  Can I arrange to change my generated code to the PMID since it's been used for so long without changing and confusing others?  I want to create a poll in advance of the meeting and need to schedule it in order to do that.

I have a large meeting for almost 1000 people later today.  
In these meetings people arrive late, or leave during the meeting. This shows in the participant panel on the right side of the screen.  As a host, is there a way only I can see the participants? This is a meditation event and all the activity of people coming and going is disturbing for the group.  
Any suggestions please?

Since the recent update, my messages are not showing up to my instructor or to other classmates.

I am also not receiving other classmate messages.

I can see a preview of the message, however after opening the chat box only certain student chat messages show up.  

Please fix.

I was recently approached by a colleague to say that she saw me on one of her calls.  However, I wasn't on this call.  She sent me a screenshot of the participants.  My login name is Lynn DeBuhr Johnson, and the person logged in was Lynn DeBuhr.  It's a different enough name that we are concerned my account has been hacked. 

I have attached the screenshot she sent me of that part of the participants list.