@afzal_m Apologies, I may have spoken too soon.
After playing with the payload formats on AllThingsTalk I do now see information coming in. Not quite exactly what i expected but I guess that’s down to misconfiguration on my part. So I’d say yes the connection works, parsing of data I need to look into.
And yes changing the URL on the application server works which is good news! 
@afzal_m Apologies, I may have spoken too soon.
After playing with the payload formats on AllThingsTalk I do now see information coming in. Not quite exactly what i expected but I guess that’s down to misconfiguration on my part. So I’d say yes the connection works, parsing of data I need to look into.
And yes changing the URL on the application server works which is good news!
@Colin-Chalmers ok, I’ve just checked a couple of things. I can send and am receiving data on IoTCreators site. I have configured the Application Server to use the AllThingsTalk callback. I have configured a device in the AllThingsTalk platform. However no data seems to be coming in and the device remains in the state inactive.
@afzal_m Thats good news, but I don’t see any change in functionality yet. As in I don’t see data arriving at AllThingsTalk. I need to test something else first before I draw conclusions
I have attached a device to send data and can confirm the data is arriving at IotCreators platform.
I tried out the application server functionality using the example with beeceptor and all works well.
Now I want to forward the data to https://api.allthingstalk.io/proxy/network/tmobilenl as a further test.
Similar to these steps:
https://www.hackster.io/voske65/arduino-nb-iot-with-sim7020-and-t-mobile-027f8f#toc-send-data-5
I thought I could have just replaced the url to Beeceptor but I keep getting an error that the URL is invalid.
I then tried to add this extra URL via the API and I got a positive response back from the server so I am assuming I now have two application servers configured?
Is my understanding correct that I cannot view or change these application server settings via the portal nor the API?
Since I have no data arriving at the destination I wanted to troubleshoot the configuration and verify that data is being sent but I don’t see any logging possibilities on the site.
Am I missing something? How are others working with the platform?