Error 429: Too many Requests when using MSXML.HTTP

Question

I am trying to communicate to a WebAPI via MSXML, but whenever I try to request a response, my error-handle is called and it shows "Statuscode 429: Too many requests". When I paste the URL which I call into my browser, I get the correct and expected response immediately. I do not understand where the problem is lying. Is my guess correct, that MSXML.HTTP-requests are send from a centralized Microsoft server? This would mean, that everybody, who is using this function to call the same API as I did, is stacking requests, leading to the API blocking the Microsoft-Sever-IP for too many requests. If so, can I somehow define the IP of a MSXML.HTTP-request?

Code used for the API-Call:

    Dim urlAPISteam As String
    Dim parametersSteam As String
    Dim url As String
    Dim clientID As String
    
    'http://steamcommunity.com/inventory/<PROFILEID>/730/2?l=english&count=##
    
    'API Request Steam
    clientID = 76561197960361544
    urlAPISteam = "https://steamcommunity.com/inventory/"
    parametersSteam = clientID & "/730/2?l=english&count=1"
    url = urlAPISteam & parametersSteam
    
    
    With CreateObject("MSXML2.XMLHTTP.6.0")
        .Open "Get", url, False
        .send

        'Error Handle
        If .Status <> 200 Then
            MsgBox "Statuscode: " & .Status & " Message: " & .responseText
            Exit Sub
        End If

        Dim response As Collection
        Set response = JsonConverter.ParseJson(.responseText)

    End With
    

I found the proxy function, but is this the only way to go? That might kill my project.

I already checked:

• I got an APIkey but it is not needed for this Request (Same issue with the key applied)