Problem
The user is prompted for credentials when publishing work packages in SPO/E Core even though Windows authentication is enabled.
Solution
Modify the security settings in Internet Explorer using the following steps:
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Open Internet Explorer from the Start menu and, click the Tools icon.
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Click Internet options.
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On the Security tab, click Custom level.
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In the User Authentication section, under Logon, select Automatic logon with current user name and password.
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Click OK.