Hi Matthew,
Thank you for writing to Microsoft Community forums.
I really appreciate your effort in trying to fix the issue.
Is your device connected to domain network?
As you’ve already tried to fix the issue by changing the registry value and also by group policy editor, I would suggest you to post your query in TechNet forums, where we have a dedicated team of experts who are equipped with the resources to suggest you with the further steps to fix the issue.
Regards,
Muralidhar
Microsoft Community Moderator