Closed Captioning (CC) in Teams is classified as a live captioning. This can be helpful in meetings for participants who are deaf, hard-of-hearing, different levels of language proficiency, and participants in loud places by giving them a way to follow along. 

Turning Closed Captioning On and Off 

To use live captions in a meeting, go to your meeting controls and select More options   > Turn on live captions (preview).

To stop using live captions, go to the meeting controls and select More options   > Turn off live captions (preview).

Make Closed Captioning Better 

These are the best practices to make closed captioning as accurate as possible. 

• Speak clearly, slowly, and directly into the microphone. The further you are from the mic, the less accurate the CC is. 
• Avoid areas with loud background noise.
• Avoid having multiple people speaking at the same time. 

Notes 

• If someone is speaking with an accent, the less accurate the captions will be. 
• Obscenities will be starred out.
• Captions will not be saved in meetings.