Outlook 2019 Autodiscover Fails on Windows 10 with Office 365 Exchange Online

Outlook 2019 autodiscover fails to add accounts on a new installation. Registry modification fixes

Outlook 2019 Autodiscover Fails on Windows 10 with Office 365 Exchange Online

Ran into an issue adding new accounts to Outlook 2019 on Windows 10 yesterday - the autodiscover process ran successfully for the first account, and then subsequently failed for each secondary account I attempted to add.

My configuration is this: fresh installatino of Windows 10 (build 1809), Azure Active Directory joined and running Office 365 Click-To-Run (CTR) on the Monthly Channel.

The account that was successfully configured was the Azure Active Directory account - Outlook configured this automatically upon first launch. Following that, secondary accounts would simply fail to add - even attempting to manually specify the account type and settings via the 'advanced' option helped. This affected both Office 365 and on-premises Exchange Accounts.

In my search for a fix I found a few different solutions, including this article on Microsoft Support indicating there may be erroneous settings under the
HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\AutoDiscover registry key. Turns out I didn't have any settings under this key, as may be expected with a newly-installed system.

Nor did adding the ExcludeExplicitO365Endpoint key per Outlook 2019 sometimes failing to add an Exchange account resolve the issue for me.

What did work was using workaround #2 from a fairly old article: Bug Alert! How to Exterminate the Autodiscover Bug in Windows 10 and Microsoft Office. Seems that the same behaviour exists in the newer Office client - not sure if it's the exact same bug - though it's fixed by adding the following key to the registry in HKEY_CURRENT_USER\SOFTWARE\Microsoft\Exchange, create a DWORD key MsoAuthDisabled:1
2019-01-09_9-51-36

Once the account was added successfully, I was able to delete the registry key; alternatively, you can set the registry key value to MsoAuthDisabled:0. Outlook seems happy with the accounts following this change.

Hope this can help you save some time when configuring new accounts in Outlook 2019!

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