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1. Join the teams meeting
   
   
   
2. Once you have joined the meeting, click "More" > "Settings" > "Meeting Options"
   
   
   
3. Click the dropdown under "Allow Meeting Chat" change it to disabled. You may also wish to turn "Allow Attendance Report" off as well.
   
   
   
   
4. Click "Save", you may need to scroll down to view the button.