401 Unauthorized Using Personal API Token

We recently acquired an API gateway, and after setting it up and trying to call different APIs(working fine with multiple different backend service).
Now, trying to invoke Pipedrive api (a simple Get on organization) using my personal Token via our API Gateway, I still receive : " ```
“response_body”: “{"success":false,"error":"unauthorized access","errorCode":401,"error_info":"Please check developers.pipedrive.com"}”

Note that the same call with same parameters works fine with Postman.
I triple checked the data sent via my Gateway and parameters seems fine.
I tried using the query param "api_token" no luck (as in thread https://devcommunity.pipedrive.com/t/401-unauthorized-error-when-using-personal-api-token-with-pipedrive-api/7298).
Tried also the header param "x-api-token" no luck either (as in thread https://devcommunity.pipedrive.com/t/401-unauthorized-error-when-using-personal-api-token-pipedrive-api/8221).
Could it be that pipedrive prevent same calls based on the geography or a specific headers are not allowed.
Please advise.

THank you in advance