Having trouble with delegate binding of my HTTP service class

Hello everybody,

at the moment i am playing around with the HTTP module and wrote a class to query weather information from a web service.
First I created a general HTTp service class like this:

#pragma once

#include "CoreMinimal.h"
#include "Runtime/Online/HTTP/Public/Http.h"
#include "Json.h"
#include "HTTPService.generated.h"

DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FHTTPOnResponseRecievedDelegate, const FString&, HttpData);

class THMVRAYPLUGIN_API UHTTPService : public UClass

    FHttpModule * Http;
    FString AuthorizationHeader = "Authorization";
    void SetAuthorizationHash(FString Hash, TSharedRef<IHttpRequest>& Request);
    void SetRequestHeaders(TSharedRef<IHttpRequest>& Request);
    bool ResponseIsValid(FHttpResponsePtr Response, bool bWasSuccessful);
    virtual void OnResponseReceived(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccesful);
    void Send(TSharedRef<IHttpRequest>& Request);

    FHTTPOnResponseRecievedDelegate responseReceived;
    TSharedRef<IHttpRequest> GetRequest(FString request);

I declared a dynamic multicast delegate for the OnResponseReceived event.
This method broadcasts the received JSON string:

void UHTTPService::OnResponseReceived(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccesful)
    if (ResponseIsValid(Response, bWasSuccesful)) {
        FString JSONString = Response->GetContentAsString();
        UE_LOG(LogTemp, Warning, TEXT("Http Response: %s"), *JSONString);


After that I created a subclass of the HTTPService class for a specific web API:

#pragma once

#include "CoreMinimal.h"
#include "HTTPService.h"
#include "HTTPWeatherService.generated.h"

class THMVRAYPLUGIN_API UHTTPWeatherService : public UHTTPService

    FString APIBaseURL = "xxxx";
    FString APIKey = "xxxx";

    void queryWeatherAPIForCoords(float lat, float lon);


Now I want to use this for a custom actor, which I wrote.
In the details panel customization I created a custom row to hold a button like this:

        auto OnWeatherButtonClicked = [myActor]
            float lat = myActor->latitude;
            float lon = myActor->longitude;
            UHTTPWeatherService * weatherService = NewObject<UHTTPWeatherService>();
            weatherService->queryWeatherAPIForCoords(lat, lon);
            return FReply::Handled();

                .Text(LOCTEXT("Current weather", "Get weather at current location"))
                .ToolTipText(LOCTEXT("Uses a web api to get information on the current weather at the current coords","Uses a web api to get information on the current weather at the current coords"))

When you click the button, it fires the function to query the web api.
What I want to do now is to bind a function to the dynamic multicast delegate.
I want to fire a method of my custom actor when the response was received.
How would you do that? Can anybody provide a piece of code?
​​​​​​​Thanks in advance =)