Routing problems in my ASP.NET Core application - missing argument

I'm trying to execute this tutorial: https://www.tutorialspoint.com/asp.net_core/asp.net_core_razor_edit_form.htm

I have a NET Core Webapp and a small list with employees (id, name). I created a Index.cshtml, Details.cshtml and Edit.cshtml. The database connection is working. When I try to click the edit or details link behind the employee name the routing seems not to be working. I just get empty sites.

Index.cshtml

@using MyApp.Controllers
@model HomePageViewModel

@{
    ViewBag.Title = "Home";
}
<h1>Welcome!</h1>

<table>
    @foreach (var employee in Model.Employees)
    {
        <tr>
            <td>@employee.name</td>
            <td>
                <a asp-controller="Employee" asp-action="Details"
                   asp-routeid="@employee.id">Details</a>
                <a asp-controller="Employee" asp-action="Edit"
                   asp-routeid="@employee.id">Edit</a>
            </td>
        </tr>
    }
</table>

Edit.cshtml

@model MyApp.Models.Employees
@{
    ViewBag.Title = $"Edit {Model.name}";
}
<h1>Edit @Model.name</h1>

<form asp-action="Edit" method="post">
    <div>
        <label asp-for="name"></label>
        <input asp-for="name" />
        <span asp-validation-for="name"></span>
    </div>

    <div>
        <input type="submit" value="Save" />
    </div>
</form>

complete controller

using Microsoft.AspNetCore.Mvc;
using MyApp.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;

namespace MyApp.Controllers
{
    public class EmployeeController : Controller
    {
        public ViewResult Index()
        {
            var model = new HomePageViewModel();
            using (var context = new FirstAppDemoDbContext())
            {
                SQLEmployeeData sqlData = new SQLEmployeeData(context);
                model.Employees = sqlData.GetAll();
            }
            return View(model);
        }
        public IActionResult Details(int id)
        {
            var context = new FirstAppDemoDbContext();
            SQLEmployeeData sqlData = new SQLEmployeeData(context);
            var model = sqlData.Get(id);


         if (model == null)
            {
                return RedirectToAction("Index");
            }
            return View(model);
        }
        [HttpGet]
        public IActionResult Edit(int id)
        {
            var context = new FirstAppDemoDbContext();
            SQLEmployeeData sqlData = new SQLEmployeeData(context);
            var model = sqlData.Get(id);

            if (model == null)
            {
                return RedirectToAction("Index");
            }
            return View(model);
        }
        [HttpPost]
        public IActionResult Edit(int id, EmployeeEditViewModel input)
        {
            var context = new FirstAppDemoDbContext();
            SQLEmployeeData sqlData = new SQLEmployeeData(context);
            var employee = sqlData.Get(id);

            if (employee != null && ModelState.IsValid)
            {
                employee.name = input.Name;
                context.SaveChanges();
                return RedirectToAction("Details", new { id = employee.id });
            }
            return View(employee);
        }
    }
    public class SQLEmployeeData
    {
        private FirstAppDemoDbContext _context { get; set; }
        public SQLEmployeeData(FirstAppDemoDbContext context)
        {
            _context = context;
        }
        public void Add(Employees emp)
        {
            _context.Add(emp);
            _context.SaveChanges();
        }
        public Employees Get(int ID)
        {
            return _context.Employees.FirstOrDefault(e => e.id == ID);
        }
        public IEnumerable<Employees> GetAll()
        {
            return _context.Employees.ToList<Employees>();
        }
    }
    public class HomePageViewModel
    {
        public IEnumerable<Employees> Employees { get; set; }
    }
    public class EmployeeEditViewModel
    {
        [Required, MaxLength(80)]
        public string Name { get; set; }
    }
}

The application asks for localhost:xxxx/Employee/Edit with argument <0> (instead of id 1 or 2...) and is redirecting to my index list at localhost:xxxx/Employee. I expected localhost:xxxx/Employee/Edit/1 but the id argument seems to be missing.

I am using @addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers in the _ViewImports.cshtml

What can I try? If you need more information, let me know!