Dear Hima Yenigalla,
Good morning.
I'm sorry to hear you're having trouble with your Bluetooth headset on Teams
First i would like to inform you that there is a list of certified devices that are well compactable with the new Teams app.
If you are not using certified devices with new teams, you will face some unexpected issues. It's true that sometimes an uncertified device can work, but for a moment. Therefore, Microsoft's recommendation to use a certified device with the Teams app.
Please review the list of the certified device, Headsets, Earbuds, and Headphones | Teams devices (microsoft.com) and Phones and Devices for Microsoft Teams - Microsoft Teams. and let us know the headset microphone Model and manufacturer you are using in team
Typically when you are using certified device and you microphone doesn't work on teams it is advice that to use this link : My microphone isn't working in Microsoft Teams - Microsoft Support to troubleshooting the issue. Follow the steps via this link and let us know. Also check this thread information : [Fix found!] Bluetooth headphones not working in MS Teams after - Microsoft Community
However, to better understand the problem and provide a solution, we need more details from you, please provide us with the following information. Thank you.
1-Please make sure Teams has permission to use your microphone. Go to Settings > Privacy > Microphone and ensure that Teams is allowed to access your microphone.
2-Some users have found that disabling the Bluetooth LE Enumerator in Device Manager helps. To do this, open Device Manager, find "Bluetooth LE Enumerator," right-click, and select "Disable"1.
3-Please Configure Audio Devices in Teams: In Teams, go to Settings > Devices and ensure your Bluetooth headset is selected for both the speaker and microphone.
4-Please in the Bluetooth settings, go to your headset's properties and uncheck services like "Audio Sink" and "Unknown Service"2. This can sometimes resolve conflicts.
5Pleasetry battery Saving Mode: Ensure that Teams is not in battery-saving mode, as this can sometimes restrict microphone access
We look forward to hearing from you. We will continue to assist you based on the information you provide to us. I would like to thank you sincerely for your patience and cooperation.
Kind regards
Eben Ezer Tres Microsoft Community Moderator