Windows Security pop up in Microsoft Outlook keeps popping up and will not go away

This is a continuing problem for me - it started a week ago. I get the popup in Outlook 10 every 30 minutes asking for my user name and password. I don't have the knowledge to handle this problem based on the above.

1. I went to the Geek Squad and they tried to fix it about 4 times and could not do it. They worked on it for 5 years = they appear to be clueless.
2. Why doesn't MSFT push through a fix - it appears that dozens of people have this problem, yet all the solutions appear to be different.

The one that keeps popping us wants my user name/password to download a gov't site. http://www.bls.gov/schedule/news\_release/bls.ics

I do not try to access this site.

I found the solution. Go to Outlook, and if you scroll down below your Inbox look for a section called Internet Calendars.I had a calendar called BLS.GOV there and i deleted it, not even sure why it was where but BLS.GOV is the Bureau of Labor and Statistics.

Dear Joatco,

Good day! Thank you for posting to Microsoft Community. We are happy to help you.

Based on your description, I understand that you have a query "Windows Security pop up in Microsoft Outlook keeps popping up and will not go away".

Basically, this issue might be caused by numerous reasons includes; when outlook is configured to prompt you for credentials, Incorrect password cached in credential storage, Required Authentication Settings for outgoing server and incoming server, Outlook Anywhere is not configured to use NTLM Authentication, Corrupt Outlook profile, Slow or unstable network connection, Antivirus programs or Shared calendars.

This may occur also if the Logon network security setting on the Security tab of the Microsoft Exchange dialog box is set to a value other than Anonymous Authentication. Refer to Outlook continually prompts for password when you try to connect to Microsoft 365 - Outlook | Microsoft Learn.

If the issue persists, please help us in isolating the issue by considering the following information:

1. What version of Outlook are you using? See What version of Outlook do I have? (microsoft.com)
2. Have you tried clearing Password from Outlook Credential Manager? Open Control Panel > Credential Manager > Click the Windows Credentials Icon > Remove all Outlook Credentials shown in this window (MS.Outlook.15:username@domain.***) > Open Outlook, Type in your password, click remember my password. Refer to Outlook prompts for credentials - Outlook | Microsoft Learn.
3. Have you tried disconnecting all the accounts > Start > Settings > Accounts > Access Work or School > Disconnected accounts that are not used as a log in to the machine.
4. Moreover, could you please try using the Outlook keeps asking for my password diagnostic to troubleshoot issues in which Outlook continually prompts for a password?

We look forward to hearing from you; Please understand that our initial reply may not always immediately resolve the issue. However, with your help and more detailed information, we can work together to find a solution. Thank you for your cooperation.

Sincerely,

De Paul | Microsoft Community Moderator

Sean - I had the calendar too ! I deleted it - I hope that this works. Thank you so much for this reply! -Bob

P.S. if you're ever in the Houston area, I owe you at least a drink.

I had to change my name to reply - not sure why.

This is a continuing problem for me - it started a week ago. I get the popup in Outlook 10 every 30 minutes asking for my user name and password. I don't have the knowledge to handle this problem based on the above.

1. I went to the Geek Squad and they tried to fix it about 4 times and could not do it. They worked on it for 5 years = they appear to be clueless.
2. Why doesn't MSFT push through a fix - it appears that dozens of people have this problem, yet all the solutions appear to be different.

The one that keeps popping us wants my user name/password to download a gov't site. http://www.bls.gov/schedule/news\_release/bls.ics

I do not try to access this site.

Hi De Paul,

All those steps had already been taken and did not seem to work at all. I proceeded to do the below and ... I dont know the combination that made it happen but it has fixed the issue

1- Office "Online repair" (again)

2- Updated to the latest Office version (I always do this)

3- From the "Office365 admin portal" I terminated all sessions

4- Changed the Office365 password

5- Reset MFA

6- and for good measure... changed the network password also.

Again... I dont know what made it work but... it is working again.

Thanks for your help anyway.