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Check your Windows audio settings. Press the Windows key and type Microphone privacy settings. Select Microphone privacy settings from the Start menu. Make sure Let apps access your microphone and Microphone access are turned on. For more on audio in Windows, see Fix sound or audio problems in Windows.
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Is your microphone unmuted? When in a meeting, select the microphone button in the meeting controls toolbar.
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If you're in a meeting, select the ellipsis (...) in meeting controls, and choose Audio settings. Check your microphone selection and see if it's showing varying levels as you speak.
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If you're not in a meeting, select the ellipsis (...) by your profile picture or initials and choose Settings. Select Devices and check your microphone choice. Try Make a test call.
For more troubleshooting info, see My microphone isn't working in Teams.