If you receive the below error message when attempting to connect to a Routing and Remote Access VPN from a Windows 10 domain-joined computer:
Can't connect to <VPN Name>
The requested operation cannot be completed. The computer must be trusted for delegation and the current user account must be configured to allow delegation
Setting delegation access on the computer or user account makes no difference.
To resolve this issue create the following registry key on the Windows 10 computer:
i.e. Right Click, create new Dword (32bit) Value, name it 'ProtectionPolicy' then edit it to the value of 1. This should then solve the issue immediately, no restart is required.