How to pass string from PowerAutomate to Logic Apps?

Question

I want to send a string to Logic Apps from Power Automate. In my company there are two set ups like this, so I know it's doable. In the logic app, I seem to be able to somehow pass it (name: Group), as one can see in the initialize variable module:

In the Power Automate flow, I try to pass the string "G2" like this:

However, the string is always empty:

I really tried to rebuild this set up like the other apps we have, but haven't been successful so far. Anyone has experience in that matter?

Answer 1

After reproducing from my end you can send the string utilizing the body of the HTTP Trigger using a JSON body. Below is the flow in my PowerAutomate.

Here is the code in my Logic apps

RESULT:

For reproducing in your environment you can use the below codeview in your logic apps

{
    "definition": {
        "$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
        "actions": {
            "Initialize_variable": {
                "inputs": {
                    "variables": [
                        {
                            "name": "Group",
                            "type": "string",
                            "value": "@triggerBody()?['Group']"
                        }
                    ]
                },
                "runAfter": {},
                "type": "InitializeVariable"
            }
        },
        "contentVersion": "1.0.0.0",
        "outputs": {},
        "parameters": {},
        "triggers": {
            "manual": {
                "inputs": {
                    "schema": {
                        "properties": {
                            "Group": {
                                "type": "string"
                            }
                        },
                        "type": "object"
                    }
                },
                "kind": "Http",
                "type": "Request"
            }
        }
    },
    "parameters": {}
}