Organizer joining a Team and then starting a meeting

Hello DebraFox19610511,

I hope this message finds you well. My name is Jeff and I am a member of this community. 

I reviewed your situation and it sounds like it can be quite frustrating to not be able to deliver your training content. I am sorry to hear that you are experiencing such a headache. I will do my best to help you. 

You can schedule a regular meeting, Teams Live Event (which are being replaced by Town Hall from what I last knew), and webinars. By the sounds of it, participants are doing one of two things (this is just my best guess without seeing it):

1) A Live Event (This is being replaced with Town Hall feature) was created and the wrong link was shared with participants. Check to ensure there isn't a Producer/Presenter link that is separate from the attendee link. Invite attendees to a live event in Microsoft Teams - Microsoft Support

2) Participants are starting regular meetings which could be prevented by adjusting the meeting options for the meeting. Meeting options in Microsoft Teams - Microsoft Support

Here are some additional resources that may or may not help our your situation:

- Schedule a meeting in Microsoft Teams - Microsoft Support

- Get started with Microsoft Teams webinars - Microsoft Support

I hope this helps.

If this does not, please let us know the exact steps you are taking to create the meeting.

For example:

1) When using the new Microsoft Teams desktop client, I select the Calendar app.

2) I select 'Schedule a Meeting' button.

3) I create my meeting. 

4) Etc. Etc. Etc.

This information may help us understand your situation.