Synchronous Service call in SAP CAPM : HTTP 500 Internal Server Error

Question

I am trying to make synchronous service call from a SAP CAPM service via a Destination. I am using service.send method to make synchronous service calls. The request gets executed fine when a single request is processed but when I try to call the same in a loop inside a Promise the request fails:

HTTP 500 Error

Code:

Error details: