Facing issue with generate JWT while generating JWT token

[priya_Edupalli]

I am getting error like the below while generating JWT Token

{
    "fault": {
        "faultstring": "Failed to Resolve Variable : policy(JWT-Generate-RS256) variable(private.privatekey)",
        "detail": {
            "errorcode": "steps.jwt.FailedToResolveVariableException"
        }
    }
}

I have stored the private key in encrypted KVM and have configured the following policy to read the KVM

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<KeyValueMapOperations name="KVW-GetPrivateSecureConfig" mapIdentifier="secrets">
    <Scope>environment</Scope>
    <ExpiryTimeInSecs>15</ExpiryTimeInSecs>
    <Get assignTo="private.privatekey">
        <Key>
            <Parameter>private.privatekey</Parameter>
        </Key>
    </Get>
</KeyValueMapOperations>

JWT Policy

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<GenerateJWT name="JWT-Generate-RS256">
    <Algorithm>RS256</Algorithm>
    <PrivateKey>
        <Value ref="private.privatekey"/>
        <Id>unique-identifier-for-privatekey-here</Id>
    </PrivateKey>
    <Subject>subject-subject</Subject>
    <Issuer>urn://apigee-edge-JWT-policy</Issuer>
    <Audience>urn://c60511c0-12a2-473c-80fd-42528eb65a6a</Audience>
    <ExpiresIn>60m</ExpiresIn>   
    <OutputVariable>output-jwt</OutputVariable>
</GenerateJWT>

Kindly help me!!