I had to put in those 'waits' else I randomly got 'Local variable referenced before assignment' errors during the POST step - which I can only guess at not having a Status code to set for status and then trying to Print that status. Its still not very reliable - It often hangs at that HTTP step and I have to reset.

Anyway - progress! Here is the nice little graph of 'realworld' data from the m5stick in a dashboard in Azure IoT - thanks for your help.

I think your DataMap and JSONdata payload looks good and is formatted correctly. Here is a slightly modified flow that has a few tweaks to set the content-type to JSON (since you are posting JSON data) and to remove the "get data" from the success/fail on HTTP request. I don't think you need that since you are doing HTTP POST and not GET. Plus you are already printing the JSONdata to the screen just before the HTTP Request.

Since I'm not an Azure IoT user, I used an Adafruit IO Webhook to verify the flow operates correctly to get data to the cloud. I get a status code 200 (HTTP OK) with the flow above. I also had to add a header with my AIO secret key, so you might need to do the same with the Azure "code" secret key. Please verify that with the Azure IoT API documentation. Give it a try and see how it goes. If it gives something other than HTTP 200 for the status, let us know what the error code is so we can troubleshoot further.

Also, I have noticed before if I try to do too much logic in the success/fail sections of the HTTP Request block, strange things can happen. So I like to keep it simple and just capture the status code to a variable and then print it after the HTTP Request has finished.

and send this rawdata variable, maybe this work, ewentually try change content type header from text to json. or send your DataMap without dump json block.

{
"device": {
"deviceId": "postmantest"
},
"measurements": {
"Temp": 29.31,
"Pressure": 44,
"humidity": 8.3,
"ledColor": "red"
}
}

For those who do code - I dont - postman says the code would be..

curl --location --request POST 'https://[sitecode].azurewebsites.net/api/IoTCIntegration?code=[key]'
--header 'Content-Type: text/plain'
--data-raw '{
"device": {
"deviceId": "postmantest"
},
"measurements": {
"Temp": 29.31,
"Pressure": 44,
"humidity": 8.3,
"ledColor": "red"
}
}'