REST API Invocation Error

Summary

REST API configured with OAuth Resource Owner Password Credentials is erroring out while invoking.

Content

Hi

We have configured REST Adapter with OAuth Resource Owner Password Credentials. While trying to invoke this REST connection in the flow it is erroring with

<ns2:APIInvocationError xmlns:ns2="http://xmlns.oracle.com/cloud/generic/rest/fault/REST/getAccessToken"&gt;
<ns2:type/>
<ns2:title/>
<ns2:detail/>
<ns2:errorCode/>
<ns2:errorDetails>
  <ns2:type/>
  <ns2:title>Non-http status code</ns2:title>
  <ns2:errorCode>REST_REQ_HDR_ERR</ns2:errorCode>
  <ns2:errorPath>&lt;![CDATA[An error occurred while processing headers in the target REST endpoint.]]&gt;</ns2:errorPath>