FCM - Programmatically Send Push Notification To User Segments [duplicate]

I am able to send the notification to single device, topics and user segment from Firebase Console.

I want to send the push notification to a user segment. I searched a lot but I'm only getting script to send notification to Single User or Topic not to user segments.

I tried the below code

var client = new RestClient("https://fcm.googleapis.com/fcm/send");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/json");
request.AddHeader("authorization", "key=mykey");
request.AddParameter("application/json", "\n\n{\"to\" : \"user-segment-name\",\n\"notification\" : {\n    \"body\" : \"test message\",\n    \"title\" : \"Portugal vs. Denmark\"\n    },\n    \"priority\":\"high\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Response.Write(response.Content); 

And I am getting the response below

{"multicast_id":5837227475989925972,"success":0,"failure":1,"canonical_ids":0,"results":[{"error":"InvalidRegistration"}]}

Solution 1:

Unfortunately, it seems that sending to user segments programatically still isn't possible. Reference here:

But you won't be able to

1. send notifications to a Firebase User Identifier (UID) and

2. send notifications to user segments (targeting properties & events like you can on the user console).

It's only possible via the Firebase Console.