Forum Discussion

akiva31's avatar
akiva31
Copper Contributor
Apr 26, 2024

Microsoft Defender will not let me log in on Windows 11

I have a subscription to the Personal Microsoft 365 plan which includes Microsoft Defender. When I try logging into Microsoft Defender on my Windows PC, I receive an error message stating "Couldn't s...
microsoft defender for office 365
39_初音ミク_39's avatar
39_初音ミク_39
Copper Contributor
Jan 08, 2026

akiva31​ 

I have same problem as you have. I've done all of the thing that could be found on the internet, but nothing solved my issue. No VPN, legit subscription, up to date applications, but does not letting me to sign in..... Did you solved the problem? Please share if you have solved T_T

 

  • Patsy-61's avatar
    Patsy-61
    Tin Contributor
    Sep 20, 2026

    Fear not! I had exactly the same problem. 'kfaj' explanation is the one to follow.

  • kfaj's avatar
    kfaj
    Tin Contributor
    Jul 15, 2026

    Defender has been replaced with "windows security". search for it in search pane - everything is there. Can also be found in settings/privacy and security.

    • Patsy-61's avatar
      Patsy-61
      Tin Contributor
      Sep 20, 2026

      Thank you! Problem solved. Problem is with terminology. Windows Security is the top level and it uses the MS Defender Antivirus to provide you (the user) with all aspects of your security protection.

  • kfaj's avatar
    kfaj
    Tin Contributor
    Jul 15, 2026

    Defender seems to have been deprecated. Instead enter control panel in search bar - then open windows security and you will fins everything you need there.

  • mizladiiv's avatar
    mizladiiv
    Copper Contributor
    Jun 26, 2026

    If you have any other antivirus software such as McAfee, Windows defender won't let you sign in