AWS Cognito User Device tracking issue

I am trying to call Confirm Device API but getting this error: Negate value passed for salt and Password verifier and as this both are optional so after removing these params from confirm device API I am getting error of "Invalid device key given"

First I am calling below API

new InitiateAuthCommand({ AuthFlow: "USER_SRP_AUTH", ClientId: clientId, AuthParameters: { USERNAME: email, SRP_A: A, }, })

second:

const respondToChallengeResponse = await cognitoClient.send( new RespondToAuthChallengeCommand({ ClientId: clientId, ChallengeName: "PASSWORD_VERIFIER", ChallengeResponses: { PASSWORD_CLAIM_SIGNATURE: signatureString, PASSWORD_CLAIM_SECRET_BLOCK: SECRET_BLOCK, TIMESTAMP: dateNow, USERNAME: USER_ID_FOR_SRP, }, }) );

third for Verify MFA Code and getting access token new RespondToAuthChallengeCommand({ ChallengeName: "SOFTWARE_TOKEN_MFA", ClientId: clientId, ChallengeResponses: { USERNAME: email, SOFTWARE_TOKEN_MFA_CODE: mfaCode, }, Session: session, UserContextData: { IpAddress: "192.168.1.168", }, });

after this API I am calling::

const confirmDeviceCommand = await cognitoClient.send( new ConfirmDeviceCommand({ AccessToken: accessToken, DeviceKey: devicekey, DeviceName: "AndroidA", DeviceSecretVerifierConfig: { PasswordVerifier: passwordResult, Salt: salt }, }) );

for Salt generation, I am using const salt = crypto.randomBytes(16);

for password verifier:

function derivePasswordVerifier(devicekey, salt) { const iterations = 10000; const keylen = 64; const hashAlgorithm = "sha256";

return crypto.pbkdf2Sync(devicekey, salt, iterations, keylen, hashAlgorithm).toString("base64");

}

Please guide me what wrong with this process.