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"unsupported_grant_type" at POST Request to OAuth 2.0 Client Credentials Grant Flow

Trying to get access_token from an OAuth 2.0 Netsuite instance set with Client Credentials Grant flow but kept getting "unsupported_grant_type".

Have the following successes:

  1. Postman was able to get access_token to the same OAuth 2.0 Netsuite instance using Authorized Code Grant flow.
  2. At the suitelet, was able to get the needed signed JWT (const signedJWT); so the RS256 private key .pem file works using the jsrsasign.js module.

At the https.post(), per SuiteAnswers 101107, I have the following header and body:

const postHeaderObj = {host: `${accountID}.suitetalk.api.netsuite.com`, "Content-Type": 'application/x-www-form-urlencoded'};

const grant_type = 'grant_type=client_credentials';

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