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If audio works fine in other apps but not in Teams, try these steps:
Check Teams settings: In Teams, go to Settings > Devices and make sure the correct microphone and speaker are selected.
Update Teams: Click your profile picture > Check for updates.
Update audio drivers: Visit Dell Support and update your sound drivers.
Disable “Exclusive Mode”: In Windows, go to Sound settings > Device properties > Additional device properties > Advanced, then uncheck Allow applications to take exclusive control.