Outlook 2021 keeps prompting for login credentials

Richard DelGrosso 0 Reputation points
2024-10-01T22:35:55.6833333+00:00

I upgraded from Office 2016 to Microsoft Office Home & Business 2021. I uninstalled 2016, then installed 2021. everything worked for a couple of weeks. Now, when I start outlook 2021, I get prompted for my login credentials for each of my hotmail and outlook accounts. (Enter yhour user name and password for the following server) Everything looks good, so I click "OK", but it fails to connect to the mail server. "reported error (0x800CCC92) email server rejected your login", "ERR Logon failure unknown user name or bad password". I can logon to the web mail with the same credentials without any problem - user name and password are accepted with out any problems. Is this related to the "modern auth" that just went into affect? The is the reason I bought 2021 was to alleviate this issue.

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  1. Greg Rich 166 Reputation points
    2024-10-02T00:52:51.9133333+00:00

    Richard - I too am on 2021 and am experiencing the same issue which just recently arose. Same error code and same easy access to my email via Outlook.com using the same password. Very frustrating.

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  2. ChristyZhang-MSFT 23,146 Reputation points Microsoft Vendor
    2024-10-02T02:21:26.6833333+00:00

    Hi @Richard DelGrosso ,

    Welcome to our forum!

    Looks like your case is related to this official article: Outlook and other apps are unable to connect to Outlook.com when using Basic authentication.

    Outlook supports OAuth in all current Microsoft 365 subscription SKUs and Outlook 2021 LTSC (any SKU with build 11601.10000 or higher) when connecting directly as Outlook.com. If your Outlook is configured to connect to Outlook.com using POP or IMAP, OAuth is not supported. This means that when Basic authentication is fully deprecated, it will no longer connect.

    If it is your issue, please try the suggested options to use OAuth to connect your Outlook.com account in Outlook client.User's image

    Hope to help you!


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