Access to PasswordVault fails for user account delegation <p>We are porting a Windows Phone 8.1 app to UWP. In the original app we used PasswordVault (<code>Windows.Security.Credentials</code>) to store user credentials and everything just worked fine. After the porting every operation related to PasswordVault throws exception with the following message:</p> <blockquote> <p>The requested operation cannot be completed. The computer must be trusted for delegation and the current user account must be configured to allow delegation. Failed to open store.</p> </blockquote> <p>If I run the app on my local machine everything is ok, but on the office tablets (with a lot of additional security things like bitlocker, user domains, etc.) the error just shows up.</p> <p>I also tried to create a blank app, and add/retrieve credentials to/from PasswordVault, but the same happened.</p> <p>Any ideas?</p>