Wrong order of evaluation for values set in the PhysicalDesktopAccessNoAcceptance key
When the PhysicalDesktopAccessNoAcceptance key is set to 'administrator' and 'system', both values are evaluated but in the wrong order. The server checks before if the user is administrator (if the user is a 'sudo' user it will ask to login), and then if the user is a system user.
As a workaround, set the key to 'system' only, so that the the request for login is not issued any longer:
PhysicalDesktopAccessNoAcceptance system
