Outlook need password popup

If you’re experiencing a blank Outlook popup and a “need password” message in Outlook 2016, it’s likely that you’re using a hybrid Exchange with Modern Authentication enabled. Even if you’ve tried all the usual solutions, such as modifying registry keys, you may still be having trouble.

You have tried all the obvious solutions you have seen online, such as forcing modifying a few registry keys, such as ExcludeExplicitO365Endpoint in HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover but also setting the EnableADAL to various values and you are still not lucky?

One solution to consider is checking your account in Azure Active Directory for sign-in error code 500011. If you see this error, it could mean that you’re missing an autodiscover record. This is a common issue and can be resolved by adding the missing autodiscover record, as outlined in the Microsoft documentation.

Solution

The URL for the documentation is https://docs.microsoft.com/en-us/exchange/configure-oauth-authentication-between-exchange-and-exchange-online-organizations-exchange-2013-help – it is important to note that this is a technical issue and it is recommended to consult with an IT professional or follow the Microsoft documentation carefully before making any changes.

$myvar = Get-MsolServicePrincipal -AppPrincipalId 00000002-0000-0ff1-ce00-000000000000
$myvar.ServicePrincipalnames.Add("https://autodiscover.mydomain.com/")
Set-MSOLServicePrincipal -AppPrincipalId 00000002-0000-0ff1-ce00-000000000000 -ServicePrincipalNames $myvar.ServicePrincipalNames

Conclusion

If you are running Outlook 2016, you may also want to remove your EnableADAL and ExcludeExplicitO365Endpoint if you had them configured while trying to fix your issue.

If you’re still experiencing issues after adding the autodiscover record, you may want to try clearing your Outlook profile and recreating it, or removing and re-adding your email account in Outlook. It is also a good idea to check if there are any updates available for your Outlook 2016, and to make sure that you have the latest version of Office installed.

If the problem persists, it is always a good idea to right click the Outlook icon in the tray bar and check the “Connections Status…” and “Test Email Autoconfigurations…” it may provide valuable information.