Integration of cloud function with firebase.

I am trying to call a parameterized cloud function deployed from FlutterFlow to Firebase Cloud Functions. This function has only one input parameter, which is of type string, and its return type is also string. I am calling this function from a FlutterFlow action and passing the parameter to it.

However, when I pass a string input to the cloud function—which has logic to simply take the input and return it as is—it returns null. On the other hand, when I return a hardcoded value, it works fine.

The return value is displayed on a page state variable.

Below is the function:

const functions = require('firebase-functions');
const admin = require('firebase-admin');
// To avoid deployment errors, do not call admin.initializeApp() in your code

exports.newCloudFunction = functions.https.onCall(
  (data, context) => {
		const inputparameter = data.inputparameter;
    // Write your code below!

    // Write your code above!
		return inputparameter;
  }
);