Unhandled Exception: [firebase_functions/not-found] NOT_FOUND -Flutter - flutter

Question

I am trying to implement the twilio_voice: ^0.0.9 plug in and register my firebase app at the same time but, when I run my registration function I get the error:
E/flutter (27321): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: [firebase_functions/not-found] NOT_FOUND
E/flutter (27321):
E/flutter (27321): #0 StandardMethodCodec.decodeEnvelope
package:flutter/…/services/message_codecs.dart:607
E/flutter (27321): #1 MethodChannel._invokeMethod
package:flutter/…/services/platform_channel.dart:156
E/flutter (27321): <asynchronous suspension>
E/flutter (27321): #2 MethodChannelHttpsCallable.call
package:cloud_functions_platform_interface/…/method_channel/method_channel_https_callable.dart:23
E/flutter (27321): <asynchronous suspension>
E/flutter (27321): #3 HttpsCallable.call
package:cloud_functions/src/https_callable.dart:35
E/flutter (27321): <asynchronous suspension>
E/flutter (27321): #4 _TextScreenState.register
package:buddiesDrivers/CallScreen/TextScreen.dart:72
E/flutter (27321): <asynchronous suspension>
E/flutter (27321):
E/flutter (27321): #0 MethodChannelHttpsCallable.call
package:cloud_functions_platform_interface/…/method_channel/method_channel_https_callable.dart:39
E/flutter (27321): <asynchronous suspension>
E/flutter (27321): #1 HttpsCallable.call
package:cloud_functions/src/https_callable.dart:35
E/flutter (27321): <asynchronous suspension>
I am have firebase implemented and running and I am getting my token when logging in. The app seems to fail when calling the httpsCallable("voice-accessToken") in the app. Here is the function:
register() async {
print("voip-registtering with token ");
print("voip-calling voice-accessToken");
final function =
FirebaseFunctions.instance.httpsCallable("voice-accessToken");
final data = {
"platform": Platform.isIOS ? "iOS" : "Android",
};
final result = await function.call(data);
print("voip-result");
print(result.data);
String androidToken;
if (Platform.isAndroid) {
androidToken = await FirebaseMessaging.instance.getToken();
print("androidToken is " + androidToken);
}
TwilioVoice.instance
.setTokens(accessToken: result.data, deviceToken: androidToken);
}
Any help in the right direction would be appreciated