dynamic checkbox is not showing selected value in ASP.Net core Razor Pages

I have a checkbox list where the values are loaded from a database table. When the user selects particular customer, it is updating the database value to '1', but in the razor pages view the values are showing unchecked. I am not sure where i am going wrong.

Please find my code below,

AccessRights.Cs(Model Class)

public class AccessRights
{
    [Key]
    public int Id { get; set; }
    public int EmployeeId { get; set; }

    [Display(Name = "Users")]
    public string Username { get; set; }
    public string ADUsername { get; set; }        
    public int CustomerId { get; set; }
    public string CustomerName { get; set; }
    public bool isSelected { get; set; }
    public string CreatedBy { get; set; }
    public DateTime? CreatedTimeStamp { get; set; }
    public string LastModifiedBy { get; set; }
    public DateTime? LastModifiedTimeStamp { get; set; }
}

Edit.Cshtml

<div class="form-group">
                <label  class="control-label"> Access To Customers</label>
                <div class="checkbox checkboxlist">
                @{
                    foreach (var customers in Model.CustomersChecked)
                    {
                    
                        <input type="checkbox" id="@customers.Value" value="@customers.Value" name="CustomersChecked" checked="@customers.Selected" />
                        <label class="text-black">@customers.Text</label><br/>
                    //<input type="hidden" asp-for="@Model.CustomersChecked" value="@customers.Id">
                    }
                }
                </div>
                <span  class="text-danger"></span>
            </div>

Edit.Cshtml.Cs

[BindProperty]
        public List<SelectListItem> CustomersChecked { get; set; }

        public async Task<IActionResult> OnGetAsync(int? id)
        {
            if (id == null || _context.AccessRights == null)
            {
                return NotFound();
            }

            var accessrights = await _context.AccessRights.FirstOrDefaultAsync(m => m.EmployeeId == id);
            AccessRights = accessrights;
            CustomersChecked = (from p in _context.AccessRights.Where(m => m.EmployeeId == id)
                                                select new SelectListItem
                                                {
                                                    Text = p.CustomerName,
                                                    Value = p.CustomerId.ToString()
                                                }).ToList();
            //CustomersChecked = CustomersChecked.Where()
            return Page();
        }

        
     
        public async Task<IActionResult> OnPostAsync(string[] CustomersChecked)
        {
            List<SelectListItem> items = (from p in _context.AccessRights.Where(m => m.EmployeeId == AccessRights.EmployeeId)
                                          select new SelectListItem
                                          {
                                              Text = p.CustomerName,
                                              Value = p.CustomerId.ToString()
                                          }).ToList();
            foreach (SelectListItem item in items)
            {
                if (CustomersChecked.Contains(item.Value))
                {
                    item.Selected = true;
                }
                else
                {
                    item.Selected = false;
                }
                AccessRights.LastModifiedBy = HttpContext.Session.GetString("DisplayName").Trim();
                AccessRights.LastModifiedTimeStamp = DateTime.Now;
                await _context.Database.ExecuteSqlInterpolatedAsync($"UPDATE [AccessRights] SET [isSelected] = {item.Selected}, [LastModifiedBy] = {AccessRights.LastModifiedBy}, [LastModifiedTimeStamp] = {AccessRights.LastModifiedTimeStamp} WHERE [EmployeeId] = {AccessRights.EmployeeId} AND [CustomerName] = {item.Text}");

            }
            return RedirectToPage("./Index");
        }

Appreciate your help! Thanks!