Opening Outlook pops up Windows Security Diagloue wanting me to input credentials

Tom Tirrell 0 Reputation points
2025-03-11T02:20:16.1933333+00:00

Hi,

I'm at my wits end. Outlook all of sudden has started asking me to input the credentials when I open Outlook. I have so far done the following:

  1. Reset password in MS Portal Admin
  2. Reset password in MS Entra
  3. Created a new Outlook Profile
  4. Tried numerous registry changes
  5. I can login via webmail with the authentication details, so I know they're correct
  6. All updates are installed for Windows 11 Pro and Office365
  7. Run both local and online repair of Outlook
  8. The computer is joined using AzureAD so the prompt by default puts in AzureAD<<email address>> with the password prompt.
  9. I have tried combinations with and without AzureAD\ at the front, the name as it appears in the Portal/Entra and also the profile folder path

If anyone can shed some light on what is happening and how I can fix it, it would be much appreciated.

Cheers,

Outlook | Windows | Classic Outlook for Windows | For business
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  1. SokiGuo-MSFT 31,551 Reputation points Microsoft External Staff
    2025-03-14T09:27:12.61+00:00

    Hi @Tom Tirrell

    Thanks for your reply!

    There are many reasons that can lead to password pop-up issues. There are some common solutions you can try:

    • Clear Cached Credentials: Open the Control Panel and go to Credential Manager. >>Under Windows Credentials, locate any entries related to Outlook or Microsoft Office.>>Remove these credentials and restart Outlook.
    • Update or Repair Outlook: Make sure your Outlook is up to date. You can also try repairing it via the Programs and Features section in the Control Panel. Repair an Office application - Microsoft Support
    • Please try using the Outlook keeps asking for my password diagnostic to troubleshoot issues in which Outlook continually prompts for a password.

    In addition, based on user feedback, you can check if this calendar exists in your Outlook client.

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