Here are a few things to check:
- Verify Email Delivery
- Check your spam/junk folder to ensure the email isn't being filtered.
- Try resending the code,sometimes there’s a delay in delivery.
- If possible, test logging in via the Teams web app to see if the issue is specific to the desktop version.
- Confirm Alternative Sign-in Methods
- If your account has Microsoft Authenticator or a phone number, try using those instead.
- Some users have successfully signed in using Windows Hello or another method.
If none of these steps resolve the issue, you might want to check out this Microsoft Community thread where users discuss similar problems.