Error 0x803100D9

Value: -2144272167 | 0x803100D9 | 2150695129

What does it mean ?

FVE_E_OSV_KSR_NOT_ALLOWED  
BitLocker Drive Encryption policy does not allow KSR operation with protected OS volume.
Value: 217 | 0x00D9 | 0b0000000011011001

Where does it come from ?

FACILITY_FVE  
Full volume encryption
Value: 49 | 0x031 | 0b00110001

Other Errors for FACILITY_FVE