Hello,
We have enabled Co-management and all devices are hybrid Azure AD joined. I configured Windows 10 Device configuration (Endpoint Protection Profile).
I encrypted OS drive without any problems. After that i configured policy to encrypt fixed data drive, after that i receive such error in Event Viewer (Bitlocker-API)
851 Silently Enctryption failed, Access Denied
][1]

This is my configuration. What could be the cause? Second partition is formatted and enabled. No additional CD/DVD drive or something like that.