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Office 365 Hybrid Constant Credential Prompts

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When an Exchange users is migrated to Office 365 they may get constant credential prompts. Even if the user enters the correct credentials the prompt will come back in a few minutes. The user might also lose the ability to access shared mailboxes and public folders.  The fix is to set all of the reg keys below to 1 , doing so will enable modern authentication. Office 2013: HKCU\SOFTWARE\Microsoft\Office\15.0\Common\Identity\EnableADAL HKCU\SOFTWARE\Microsoft\Office\15.0\Common\Identity\Version Office 2016: HKCU\SOFTWARE\Microsoft\Office\16.0\Common\Identity\EnableADAL All versions 2013+ Create this even if you are on 2016 where it is enabled by default HKEY_CURRENT_USER\Software\Microsoft\Exchange\AlwaysUseMSOAuthForAutoDiscover Restart Outlook and the prompts should go away.  https://docs.microsoft.com/en-us/exchange/troubleshoot/modern-authentication/modern-authentication-configuration https://docs.microsoft.com/en-us/exchange/troubleshoot/client-connectivity/outlook-prompt-password-