CORs Error for /v1/chain/push_transactions To Production Block Producer (Not localhost)

All of my other POST calls to a production EOS BP are succeeding no problem. However, when I use push_transactions via ScatterJS I get a 500 CORs error.

const networkJson = {
  blockchain:'eos',
  host:'api1.eosasia.one',
  port:443,
  protocol:'https',
  chainId:'aca376f206b8fc25a6ed44dbdc66547c36c6c33e3a119ffbeaef943642f0e906'
};

const network = ScatterJS.Network.fromJson(networkJson);
const rpc = new eosjs2.Rpc.JsonRpc("https://api1.eosasia.one:443", { fetch });
const api = ScatterJS.eos(network, Api, {rpc})

async function takeScatterAction(action, dataValue, account) {
  const id = await ScatterJS.login();
    if (!id) {
      alert(`not logged in`)
    }

  // error is in while executing this api.transact call. 
  const resultWithConfig = await api.transact(
    {
      actions: [
        {
          account: CONTRACT_NAME,
          name: action,
          authorization: [
            {
              actor: account.name,
              permission: account.authority
            }
          ],
          data: dataValue
        }
      ]
    }
    ,
    {
      blocksBehind: 3,
      expireSeconds: 30
    }
  );
  console.log(resultWithConfig);
  debugger;
  return resultWithConfig;
}

By calls to get chain info succeed no problem: /get_block, /get_required_keys, get_info, get_table_rows.

Curious what I may be doing incorrectly? Thanks for your input!