Error 0x8009400C

Value: -2146877428 | 0x8009400C | 2148089868

What does it mean ?

CERTSRV_E_BAD_REQUEST_KEY_ARCHIVAL  
The request is incorrectly formatted. The encrypted private key must be in an unauthenticated attribute in an outermost signature.
Value: 16396 | 0x400C | 0b0100000000001100

Where does it come from ?

FACILITY_SSPI  
Used for status code returned by Security Support Provider Interface (SSPI)
Value: 9 | 0x009 | 0b00001001

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