To change your notification sound in Teams, here are the steps you’ll want to follow:

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1. Open Microsoft Teams.
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2. Tap on your profile picture at the top left corner.
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3. Select Settings from the drop down menu that appears.
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4. Locate the Notifications & Sounds tab at the left side of the Settings interface.
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5. Under the Settings tab, select the Change button next to Sound.
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6. Choose your desired sound from the list of options, or click Advanced to add a custom sound.
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7. When you’re done, hit the Save button from the top right corner of the Settings interface.