Steps to solve Outlook not authenticating correctly with Microsoft 365.
- Completely close Outlook application
- Clear the credential manager (remove anything related to the office 365 account)
- From the windows search bar type Access work or school and disconnect the account.
- Open the registry editor and navigate to the following location
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity:”EnableADAL”=dword:1 and type is Decimal 1 - Relaunch Outlook
Microsoft Office 2013 on Microsoft Windows computers supports Modern authentication. But, to turn it on, you need to configure the following registry keys:
| Registry key | Type | Value |
| HKEY_CURRENT_USER\Software\Microsoft\Exchange\AlwaysUseMSOAuthForAutoDiscover | REG_DWORD | 1 |
| HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Identity\EnableADAL | REG_DWORD | 1 |
| HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common\Identity\Version | REG_DWORD | 1 |
Hope this resolved it !!
