Again - Error in SoapUI, but NOT Postman

Hi,

I have a request that works in Postman but doesn't in SoapUI, and I'm trying to convert all our Postman tests into SoapUI.

The Postman settings are as follows:

POST - https://login.XXXX.com/XXX.onmicrosoft.com/oauth2/token
No Auth

Headers = Cache-Control:no-cache, Content-Type:application/x-www-form-urlencoded

Body (application/x-www-form-urlencoded) is blank but when I select the edit text 
option it reveals the following:

client_id:ac353c3b-249c-4615-900f-7fb0dc748e07
resource:https://XXX.crm4.dynamics.com
username:muleservice@XXX.onmicrosoft.com
password:YKbaa436Regi4178
grant_type:password

I tried to emulate this in SoapUI with the following:

POST - https://login.XXXX.com/XXX.onmicrosoft.com/oauth2/token
No Auth

Headers = Cache-Control:no-cache

MediaType = 'application/x-www-form-urlencoded'

In the Request body I copied the contents from Postman request 'body' straight into 
the Request body section in SoapUI

client_id:ac353c3b-249c-4615-900f-7fb0dc748e07
resource:https://XXX.crm4.dynamics.com
username:muleservice@XXX.onmicrosoft.com
password:YKbaa436Regi4178
grant_type:password

NOW - when I run it in Postman - it runs fine - but when I run it in SoapUI I get a response stating the response is invalid and that 

'The request body must contain the following parameter: 'grant_type''

HOWEVER - as you can see - my request body DOES include a 'grant_type' parameter!!

Does anyone know what I'm doing wrong?

I didn't know anything about this 'application/x-www-form-urlencoded' mediatype and I did some reading and it stated that POST requests use this and another type (multipart-formdata) is just lie having loads of parameters in your URI string so I tried adding the parameters into a query string at the end of the URI I was submitting - but this didn't work

I've installed fiddler and I'm going to see if I can see a difference between what's being posted Postman vs SoapUI.

I'd welcome any help/guidance/advice you can give me.

I've attached some screenshots of Postman and SoapUI settings and I've also attached an extract of my ReadyAPI! Log file - no application errors are reported.

Thanks to all!

richie