Hi Muralikrishna,
Thanks for reaching out Microsoft Community Forum. I totally understand your concern you are having trouble with your passkey. Let me help you with that.
☻Option1: If You Can Still Access Your Account
• Go to
https://account.microsoft.com/security
• Log in using your password, not a passkey
• If you don’t see the password option
• Click Use another method
• Go to Advanced Security Options
• Under Sign-in Preferences or Passkeys look for:
♦ Any saved Windows Hello
♦ FIDO2 keys
♦ Any linked devices
• Remove/Delete each passkey or device listed.
☻ Option2: If you can’t Log In at All
• Go to recovery page
• Enter your Microsoft email
• Fill out the form with:
♦ Old passwords
♦ Recovery email or phone
♦ Any services linked (Xbox, Skype, etc.)
• Microsoft will review and help you regain access
• After that, you can follow Option 1 to remove passkeys
Note:
• After removing passkeys, it's best to:
• Set a strong password
• Using your phone or email
• Set up two-factor authentication
I hope this helps and works for you.
Best Regards,
Kelvin || Independent Adviser