Change your default Microphone, Speaker, or Camera in Teams

To select the mic, speaker, and camera you want Teams to use for calls and meetings, select Settings and more next to your profile picture at the top of Teams and then choose Settings > Devices. 

Under Audio devices, pick the speaker and mic you want Teams to use by default. 

Under Camera, select the camera you want Teams to use, and see a preview of that camera's video. 

Within the Teams meeting itself, you can enable your Microphone and/or Camera before and during a meeting by moving the bar across on the device you want to turn off/on.