FIX: Outlook 0x800CCC92 Error accessing Office365 POP3 mail server. (Solved) – wintips.org

If Outlook for Windows cannot authenticate with the Office365 POP3 email server “outlook.office365.com” (error 0x800CCC92), continue reading below to resolve the issue.

(June 16, 2022). In the last (2) days, Outlook started showing the following error message when clicking the Send/Receive button: “Access Incoming Mail Server (POP3): Your email server refused access.Confirm your username and password for this account in your account settings. The server responded: -ERROR: login error: unknown username or invalid password. Receiving message (0x800CCC92)”. Outlook is configured as POP with “outlook.office365.com” and no changes have been made to account settings or username or password.

Outlook 0x800CCC92 - Error accessing Office365 POP3 account

The first strange thing about receiving Outlook error 0x800CCC92 is that when the problem occurred, Outlook was always unable to connect to the Office365 POP3 server and receive emails without problems.

The second strange thing is that the problem only occurs in Microsoft Outlook 2016 and 2019 for Windows, not on iPhone or Android devices.

The third oddity is that the 0x800CCC92 receive error only appears if the Office356 account is configured as POP3 in Outlook and not as IMAP or Exchange. Also, OWA works without any problems.

How to Fix Outlook Receive Error 0x800CCC92 with POP3/IMAP and Office365 Exchange Online (Outlook 2019/2016/2013/2010/2007)

After many hours of searching for a solution to the problem, I came across the following article where I discovered that Microsoft had started to disable basic authentication in Exchange Online and completely removed it. October 1, 2022.

After reading this article, you should be able to use basic authentication in Exchange Online for Microsoft Exchange ActiveSync (EAS), POP, IMAP, Remote PowerShell, Exchange Web Services (EWS), Offline Address Book (OAB), Outlook for Windows I understand that it was removed. , and requires Macs and clients to switch from apps using Basic authentication to apps using Modern Authentication (OAuth 2.0 token-based authorization).

And the fourth strange thing about this problem: since Outlook 2019 and 2016 already support Modern authentication, why does it not connect to Office365 POP3?

After all this, I found the cause of the problem in the Office365 admin center: although Microsoft has automatically disabled basic authentication, it has not automatically enabled modern authentication!

So, if you have similar problems with Outlook authentication with Office385 POP3, use one of the following methods to enable Modern authentication in Office365 and enable or disable access to basic authentication protocols (POP3, IMAP, etc.).

Method 1. Enable modern authentication in the Office365 admin center dashboard.

1. Sign in and go to the Microsoft 365 admin center Settings > Organization settings.

Fix Outlook Receive Error 0x800CCC92

2. Open the Services tab Modern authentication.

enable modern authentication office 365 control center

3. Yes Modern authentication settings, apply the following settings and click Save:

  1. Check Enable Modern Authentication for Outlook 2013 for Windows and later versions (recommended).
  2. If you want to continue using basic authentication (for example, if you have Outlook 2010 or earlier), select the appropriate check boxes under “Allow access to basic authentication.”

*Notes:
1. Because Microsoft completely disables the basic authentication method October 1, 2022 it is recommended to update your clients and disable basic authentication for all protocols.

2. If you’re using Outlook 2010, 2007, or 2003, turn on basic authentication now and upgrade to Outlook 2016, 2019, etc. first. October 1, 2022.

enable modern basic authentication Office 365 control center

4. Now wait about 30 minutes for the changes to take effect and then restart Check that Outlook and Office365 connect to POP3 without any problems. (I tried it after about an hour).

5. If you keep basic authentication enabled, Outlook will now connect to Office365 without any problems. If you’ve turned off basic authentication, you’ll be prompted to sign in to Office365 again. In this case, enter your account in the modern authentication dialog box to sign in to Office365. *

*Note: If you still can’t connect to Office365 from Outlook, see the endnotes at the end of this article.

image

Method 2. Enable modern authentication in Office365 Exchange Online using PowerShell.

1. Connect to Exchange Online using PowerShell.

2. Now you decide to do one of the following: *

A. Run the following command to enable modern authentication connections to Exchange Online by Outlook 2013 or later clients:

  • Set-OrganizationConfig -OAuth2ClientProfileEnabled $true

or…

B. Run the following command to prevent modern authentication connections to Exchange Online by Outlook 2013 or later clients (using basic authentication connections):

  • Set-OrganizationConfig -OAuth2ClientProfileEnabled $false

3. Now wait at least 30 minutes for the change to take effect and then restart Check that Outlook and Office365 connect to POP3 without any problems

Final Notes:

  • Support for Modern Authentication is already enabled in Outlook for Office 365, Outlook 2019, and Outlook 2016, but Outlook 2016 may need to make an additional registry change for Modern Authentication to work.
  • Outlook 2013 supports modern authentication, but it is not enabled and you need to set the following registry keys for it to work:
Registry key Type

Value

HKEY_CURRENT_USER\Software\Microsoft\Exchange\Always use MSOAuth for AutoDiscover REG_DWORD

1

HKCU\SOFTWARE\Microsoft\Office\15.0Common\Identity\Enable ADAL REG_DWORD

1

HKCU\SOFTWARE\Microsoft\Office\15.0\Common\Identity\Version REG_DWORD

1

  • Outlook 2010 client and older Outlook versions do not support Modern Authentication, so upgrade them to Outlook 2016, 2019, etc. or use Thunderbird as your email client.

SOURCES:

That’s it! Which method worked for you?
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