400 Bad Request Error using URLFetchApp and Google sheets Script - google-apps-script

Question

I have the below script, that is returning a 400 - bad request.
function createIssue(e)
{
var url = "https://jira.xxxx.com/rest/api/2/issue/";
var data = {'fields': {
'project': {'key':'DWH'},
'summary':'Resttest',
'description':'test',
'issuetype':{ 'name': 'Data Requests'},
'components':[{ 'name':'Data Warehouse'}],
'fixVersions':[{ 'name':'NA'}] }};
var payload = JSON.stringify(data);
Logger.log(payload);
var headers =
{
'content-type': 'application/json',
'Accept': 'application/json',
'authorization': 'Basic xxxxxxxxxxxxxx'
};
var options =
{
'content-type': 'application/json',
'method': 'POST',
'muteHttpExceptions' : true,
'headers': headers,
'payload': payload
};
var response = UrlFetchApp.fetch(url, options);
var rc = response.getResponseCode();
var responseText = response.getContentText();
var dataAll = JSON.parse(response.getContentText());
var issueKey = dataAll.key
Logger.log(dataAll)
}
I have tested out the actual payload via cURL and it was working, so Is there something else I am missing with this script?
Thanks a million for any assistance.
Best,
Neil
EDIT:
The curl command :
curl -D- -H
"Authorization: Basic xxxxxxxxxxxx1bXBraW5zMDQh" -X POST --data
"{ """fields""": { """project""": { """key""": """DWH""" }, """summary""":
"""REST test 11111.""", """description""": """test""", """issuetype""": {
"""name""": """Data Requests""" }
,"""components""":[{ """name""":"""Data Warehouse"""}] , """fixVersions""":
[{"""name""":"""NA"""}]} }" -H "Content-Type: application/json"
https://jira.xxxxxxxxx.com/rest/api/2/issue/
I was doing some further reading and it appears that the google apps scripts are run from the google servers. My jira instance is behind a company intranet, and as such not accessible from googles servers. I also note a useIntranet feature that is depreciated. Is there any way around this?
Many thanks,
Neil