[Python] Failed Validation while setting up LinkedIn Webhook

@app.route('/webhooks/linkedin', methods=['GET'])
def webhook_challenge_linkedIn():

# creates HMAC SHA-256 hash from incoming token and your consumer secret
sha256_hash_digest = hmac.new(bytes({api_secret},'utf-8'), msg=bytes(request.args.get('challengeCode'),'utf-8'), digestmod=hashlib.sha256)

# construct response data with base64 encoded hash
print((sha256_hash_digest))
val = {
"challengeCode" : request.args.get('challengeCode'),
"challengeResponse" : sha256_hash_digest.hexdigest()
}

return json.dumps(val)


When I try to set up the server and send an authentication request from LinkedIn for webhook to this endpoint it says Failed Validation

all i need to do for the verification is return the challenge code in

challengeResponse = Hex-encoded(HMACSHA256(challengeCode, clientSecret))


I think this is what I did but the still validation gets failed.

I don't seem to see the issue.

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