Keep getting 401 in zero footprint synchronous screening api hit through postman

My request looks like this:

curl -X POST \
https://zfs-world-check-one-api-pilot.thomsonreuters.com/v1/cases/screeningRequest \
  -H 'Authorization: Signature keyId="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",algorithm="hmac-sha256",headers="(request-target) host date content-type content-length",signature="xxxxxxx"' \
  -H 'Content-Length: 174' \
  -H 'Content-Type: application/json' \
  -H 'Date: Mon, 11 Feb 2019 06:22:35 GMT' \
  -H 'cache-control: no-cache' \
  -d '{
  "groupId":"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "entityType": "INDIVIDUAL",
  "providerTypes": [
    "WATCHLIST"
  ],
  "name": "John Smith",
  "secondaryFields":[]
}'

API key and secret were received on 1st Feb.

Request from postman console:

POST /v1/cases/screeningRequest
Date: Mon, 11 Feb 2019 07:37:01 GMT
Content-Type: application/json
Authorization: Signature keyId="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",algorithm="hmac-sha256",headers="(request-target) host date content-type content-length",signature="xxxxxxx="
Content-Length: 174
cache-control: no-cache
Postman-Token: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
User-Agent: PostmanRuntime/7.6.0
Accept: */*
Host: zfs-world-check-one-api-pilot.thomsonreuters.com
accept-encoding: gzip, deflate

{ "groupId":"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx", "entityType": "INDIVIDUAL", "providerTypes": [ "WATCHLIST" ], "name": "John Smith", "secondaryFields":[] }

Response from postman console:

HTTP/1.1 401
status: 401
Content-Type: application/json
Content-Length: 2
Connection: keep-alive
Date: Mon, 11 Feb 2019 07:37:02 GMT
x-amzn-RequestId: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
x-amzn-ErrorType: AccessDeniedException
x-amz-apigw-id: xxxxxx
X-Cache: Error from cloudfront
Via: 1.1 7a9b0a23f7c6fe6c2e662de66ef2e630.cloudfront.net (CloudFront)
X-Amz-Cf-Id: xxxxxx

[]

@Mehran.Ahmed Khan Still getting 401. Postman console log of new request shared below:

POST /v1/cases/screeningRequest
Date: Tue, 12 Feb 2019 04:36:38 GMT
Content-Type: application/json
Authorization: Signature keyId="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",algorithm="hmac-sha256",headers="(request-target) host date content-type content-length",signature="xxxxxxxx"
Content-Length: 174
cache-control: no-cache
User-Agent: PostmanRuntime/7.6.0
Accept: */*
Host: rms-world-check-one-api-pilot.thomsonreuters.com
accept-encoding: gzip, deflate


{ "groupId":"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx", "entityType": "INDIVIDUAL", "providerTypes": [ "WATCHLIST" ], "name": "John Smith", "secondaryFields":[] }


HTTP/1.1 401
status: 401
X-Application-Context: application
Authorization: WWW-Authenticate: Signature realm="World-Check One API",algorithm="hmac-sha256",headers="(request-target) host date content-type content-length
Transfer-Encoding: chunked
Date: Tue, 12 Feb 2019 04:36:38 GMT
Server: ""