Hello bradavon,
Like the Surface Pro X, the HP ENVY x2 has the "Windows Hello Face" sign-in capability. I never set this feature up under Windows Settings > Accounts > Sign-in options. Only the "Windows Hello PIN" feature. With "Windows Services" selected under Registry of CCleaner, I only know that it would corrupt the registry key related to the Windows Hello PIN feature. Since they are both sign-in features, I can only assume that it would have the same effect.
I agree with nukecad's comment above. For me, I am not afraid of tinkering with the registry and starting over with a fresh factory image. That is the case with how I discovered the "Windows Services" was the culprit for corrupting the sign-in registry key. When this happened, I started over with a clean slate, and kept checking the boxes in CCleaner until I reproduced the issue again. Then started over with a fresh factory image. In hindsight, I should have backed up the registry, and just reverted!
However, the HP ENVY x2 is not my main computer. I picked it up on eBay for a fair price to learn Windows 10 on ARM. Let me know if there is anything you would like me to try.
I hope I answered your question!
Joe