If you have an active directory environment, and when trying to login to your active directory workstation (not domain controller), you get the error:

"The trust relationship between this workstation and the primary domain failed"

You will need to re-authenticate and update any tokens on the workstation. This is easily done by logging into the workstation as the local administrator (./Administrator) and then running:

Reset-ComputerMachinePassword -Server domaincontroller -Credential Administrator

Re-enter the administrator password when prompted.

If the command 'Test-ComputerSecureChannel' is coming back false you could run

Test-ComputerSecureChannel -Repair -Credential administrator