CloudMirror / CFAPI / Can't get access to cloud data via system service.

Turned out app started in service session (0) despite system privileges can't trigger data hydration from the cloud.
Although if data already pulled to sync root service app can read data without issues.

Exception discovered: if executable placed in %systemroot% it can trigger hydration.

Error client (service session) app receives: Access to the cloud file is denied. - 0x0000018B (395)
in ProcessMonitor(sysinternals) it would be error 0xC000CF18 indicated in CreateFile.

Issue can be reproduced by pointing any service app to not yet hydrated file in sync root for reading.

Or this way:

• Copy executable file C:\Windows\System32\more.com to C:\more.com

• Run in elevated console: psexec -h -s cmd

• Try open any file in local sync root like: C:\more.com C:\sync_root_folder\cloud_file
  get Cannot access file error.

• Run: C:\WINDOWS\system32\more.com C:\sync_root_folder\cloud_file
  see it opens fine.

Already discussed in Docs Q&A, directed to this issue tracker from there.
https://docs.microsoft.com/en-us/answers/questions/892349/cfapi-allow-data-fetch-for-services.html

Thanks,

Start by reproducing the service-session behavior with the documented PsExec command and compare opening the same unhydrated sync-root file from C:\more.com and C:\Windows\System32\more.com. The issue provides no repository file, test, or requested code change; done would require an agreed explanation or fix for service access to cloud hydration.