A Microsoft file hosting and synchronization service.
I have the same problem. I tried this fix and a variety of other attempts at fixing, checking for viruses, restarting etc.
With mine, any file that is on the cloud is inaccessible. It appears, but always gives the "0x8007017C: The Cloud operation is invalid" error.
I am now unable to access cloud based files and cannot work.
This is a serious issue that clearly resides within OneDrive and not elsewhere.
Chris