B4J Question Firebase Error

public Sub SendMessage(Topic As String, Title As String, Body As String, Data As Map) As ResumableSub
    Dim sdeviceID As String = Data.get("deviceid")
    Dim smsgType As String = Data.get("msgtype")
    Dim smsgdate As String = Data.get("msgdate")
    Dim sVoltage As String = Data.get("voltage")
    '
    smsgdate = NiceDate(smsgdate)
    Dim stitle As String = GetMessageTitle(sdeviceID, smsgType)
    Dim sBody As String = stitle & ", voltage @ " & sVoltage & ", on " & smsgdate
   
    Dim m As Map = CreateMap("to": $"/topics/${Topic}"$)
    Data.Put("topic", Topic)
    Data.Put("title", stitle)
    Data.Put("body", sBody)
    If Topic.StartsWith("ios_") Then
        Dim iosalert As Map =  CreateMap("title": stitle, "body": sBody, "sound": "default", "icon": "./assets/appicon.png")
        m.Put("notification", iosalert)
        m.Put("priority", 10)
    Else
        Dim pri As Map = CreateMap("priority":"high")
        m.Put("priority", "high")
        m.Put("android", pri)
    End If
    m.Put("data", Data)
   
    Dim jg As JSONGenerator
    jg.Initialize(m)
    '
    Dim msgOut As String = jg.ToString
    Log(msgOut)
   
    Dim j As HttpJob
    j.Initialize("fcm", Me)
    j.PostString("https://fcm.googleapis.com/fcm/send", msgOut)
    J.GetRequest.SetContentType("application/json;charset=UTF-8")
    J.GetRequest.SetHeader("Authorization", "key=" & API_KEY)
    Wait For (j) JobDone (j As HttpJob)
    If j.Success = True Then
        ' Reply from Firebase
        Dim jp As JSONParser
        jp.Initialize(j.GetString)
        Dim rp As Map = jp.NextObject
        Dim message As String = rp.Get("message_id")
        'this is important for the associations related content
        'convert the map to an array of objects
        Data.Put("msgid", message)
    Else
        Data.Put("msgid", "")
        Log(j.ErrorMessage)
    End If
    j.Release
    Data.Put("status", "A")
    Return Data
End Sub

ResponseError. Reason: , Response: {"error":"Deprecated endpoint, see https:\/\/firebase.google.com\/docs\/cloud-messaging\/migrate-v1"}
{"error":"Deprecated endpoint, see https:\/\/firebase.google.com\/docs\/cloud-messaging\/migrate-v1"}