Hello, Mike Wright2
Welcome to Microsoft Community.
I’m sorry to hear that you are having trouble with Windows Hello Face and your Logitech Brio camera. I can understand how frustrating it can be when something that should work doesn’t.
Based on the information you provided, it seems that you have tried many possible solutions and none of them worked. I found some similar cases where other users reported the same issue with their Logitech Brio cameras and Windows Hello Face:
Logitech Brio Does Not Work with Windows Hello Face - Microsoft Community
Windows Hello No Longer Working with Logitech BRIO 4K Webcam after Logi Tune Firmware update : r/logitech (reddit.com)
One common factor that I noticed is that some users said that the problem started after they updated their Logitech Tune software or firmware. They suggested that the update might have interfered with the infrared/IR depth camera that Windows Hello Face needs to access. Some of them were able to fix the issue by uninstalling the Logitech Tune software or rolling back to a previous firmware version.
Another possible solution that some users reported was to disable the “Allow the computer to turn off this device to save power” option for the USB root hub that the camera is connected to. This can be done by going to Device Manager, expanding the Universal Serial Bus controllers category, right-clicking on the USB root hub, selecting Properties, going to the Power Management tab, and unchecking the box.
You may find more useful information in the responses which may help fix the issue.
If none of these solutions work for you, you might want to contact Logitech support for further assistance, as there might be a hardware issue. They might have more insight into what is causing the issue and how to resolve it:
Submit a request – Logitech Support + Download
Disclaimer: Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.
You can also report the issues you're experiencing through the Windows Feedback Hub. This allows Microsoft to gather information and potentially address the problem in future updates. To submit feedback to the developers, simultaneously press the Windows logo key and the F key on your keyboard.
Let me know if you have any other concerns.
Best regards
Yuhao Li
Microsoft Community Technical Support