Error 0x803100AF

Value: -2144272209 | 0x803100AF | 2150695087

What does it mean ?

FVE_E_EDRIVE_NO_FAILOVER_TO_SW  
BitLocker did not revert to using BitLocker software encryption due to group policy configuration.
Value: 175 | 0x00AF | 0b0000000010101111

Where does it come from ?

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

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