问转换为“任务”返回委托的异步lambda表达式不能返回值

EN

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, ITableRepositories repository)
{
    // ...  
    app.UseStaticFiles();    
    app.UseCookieAuthentication();

    app.UseOpenIdConnectAuthentication(new OpenIdConnectOptions
    {
        ClientId = Configuration["..."],
        Authority = Configuration["..."],
        CallbackPath = Configuration["..."],
        Events = new OpenIdConnectEvents
        {
            OnAuthenticationFailed = context => { return Task.FromResult(0); },
            OnRemoteSignOut = context => { return Task.FromResult(0); },
            OnTicketReceived = async context =>
            {
                var user = (ClaimsIdentity)context.Ticket.Principal.Identity;
                if (user.IsAuthenticated)
                {
                    var firstName = user.FindFirst(ClaimTypes.GivenName).Value;
                    // ...
                    List<Connection> myList = new List<Connection>() { c };
                    var results = await repository.InsertOrMergeAsync(myList);
                    var myConnection = (results.First().Result as Connection);                         
                }
                return Task.FromResult(0); // <<< ERROR HERE ....... !!!
            },
            OnTokenValidated = context => { return Task.FromResult(0); },
            OnUserInformationReceived = context => { return Task.FromResult(0); },
        }
    });

    app.UseMvc(routes =>        { ...        });
}

namespace Microsoft.AspNetCore.Authentication
{
    public class RemoteAuthenticationEvents : IRemoteAuthenticationEvents
    {
        public Func<TicketReceivedContext, Task> OnTicketReceived { get; set; }