It seems like you've covered the basic settings on both Outlook and the macOS system preferences. To address the Microsoft Teams timezone issue on a Mac, consider the following steps:
Microsoft Teams Settings:
• Open Microsoft Teams.
• Click on your profile picture at the top right.
• Select "Settings."
• Under the "General" tab, check the "Time zone" setting and ensure it is set to the correct timezone (IST).
System Timezone Override:
• In macOS, go to "System Preferences."
• Select "Date & Time."
• Make sure the "Set time zone automatically using current location" option is checked.
Restart Microsoft Teams:
• Close Microsoft Teams completely.
• Reopen the application and check if the timezone is now correct.
Update Microsoft Teams:
Ensure that Microsoft Teams is up to date. Check for any available updates and install them.
Check macOS Updates:
Make sure your macOS is updated to the latest version. Updates might include fixes for such issues.
User Account:
Confirm that the user's Microsoft Teams account settings online reflect the correct timezone.
If the issue persists after following these steps, there might be a more complex problem, and you may need to contact Microsoft support for further assistance.