Error 0x80310063

Value: -2144272285 | 0x80310063 | 2150695011

What does it mean ?

FVE_E_POLICY_STARTUP_KEY_REQUIRED  
Group Policy settings require the use of a startup key. Please choose this BitLocker startup option.
Value: 99 | 0x0063 | 0b0000000001100011

Where does it come from ?

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

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