Error 0x80310066

Value: -2144272282 | 0x80310066 | 2150695014

What does it mean ?

FVE_E_POLICY_STARTUP_TPM_NOT_ALLOWED  
Group policy does not permit the use of TPM-only at startup. Please choose a different BitLocker startup option.
Value: 102 | 0x0066 | 0b0000000001100110

Where does it come from ?

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

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