@Munro, Tricia
According to the description of your problem, you can try the following steps:
Step 1: Make sure there is no problem with your headset device, change the headset or use the speakers that came with your computer.
Step 2: Close all other applications that may be using your speakers.
Step 3: Make sure that Teams and your computer are using the same speakers.
Step 4: Be sure to unmute the microphone before or during the meeting.
Before the Meeting: Next to your profile picture at the top of Teams--> Settings--> devices-->Audio devices-->Microphone-->Make a test call.
During the Meeting: Teams Meeting Window--> Settings--> devices Setting-->Microphone.
Step 5: Check the Windows sound setting
Windows-->Sound setting-->Input-->Select device to speak to record-->Volume.
You may refer to the article.
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