For whatever reason, trying to connect to a VPN from a domain account that was connected using the VPN has issues:
The requested operation cannot be completed. The computer must be trusted for delegation and the current user account must be configured to allow delegation.
Go to this registry key:
Add a DWORD called
ProtectionPolicy and give it a value of 1.
Copied from https://www.myrtec.com.au/windows-10-vpn-error-computer-not-trusted/