Problem with AAD authentication #10171

Hi,

I converted my web application running on Azure from version 4.3 to version 9.3.6 of Abp.io. I'm having an issue with AAD authentication, which doesn't seem to work as it used to. The problem is that once authenticated the redirect on the main page shows a 502 error

This is the code I use for authentication:

private void ConfigureExternalProviders(ServiceConfigurationContext context)
{
    context.Services.AddAuthentication()
        .AddOpenIdConnect("AzureOpenId", "Azure Active Directory OpenId", options =>
        {
            options.Authority = "https://login.microsoftonline.com/" + context.Configuration["AzureAd:TenantId"] + "/v2.0/";
            options.ClientId = context.Configuration["AzureAd:ClientId"];
            options.ResponseType = OpenIdConnectResponseType.CodeIdToken;
            options.CallbackPath = context.Configuration["AzureAd:CallbackPath"];
            options.ClientSecret = context.Configuration["AzureAd:ClientSecret"];
            options.RequireHttpsMetadata = false;
            options.SaveTokens = true;
            options.GetClaimsFromUserInfoEndpoint = true;
            options.SignInScheme = IdentityConstants.ExternalScheme;
            options.Scope.Add("email");
            options.ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "sub");

            if (context.Services.GetHostingEnvironment().IsProduction())
            {
                options.Events = new OpenIdConnectEvents
                {
                    OnRedirectToIdentityProvider = redirectContext =>
                    {
                        redirectContext.ProtocolMessage.RedirectUri = context.Configuration["AzureAd:RedirectToIdentityProviderUri"];
                        return Task.CompletedTask;
                    }
                };

            }
        });
}

The configuration parameters are exactly the same as those in version 4.3. What could be the problem? Where can I investigate?