This is ASP.NET Razor Pages Project with ASP.NET Identity Registration Page (.NET 8).

Email checking (PageRemore) works fine, but only if the Email property is not a member of the Input class (automatically generated by ASP.NET Identity)

[BindProperty]
[Required]
[EmailAddress]
[Display(Name = "Email")]
[PageRemote(
    ErrorMessage = "This email is already registered",
    AdditionalFields = "__RequestVerificationToken",
    HttpMethod = "post",
    PageHandler = "CheckEmail"
    )]
public string? Email { get; set; }

Once you put this construction in a Input class, everything stops working.

[BindProperty]
public InputModel Input { get; set; }
public class InputModel
{
    [Required]
    [EmailAddress]
    [Display(Name = "Email")]
    [PageRemote(
        ErrorMessage = "This email is already registered",
        AdditionalFields = "__RequestVerificationToken",
        HttpMethod = "post",
        PageHandler = "CheckEmail"
        )]
    public string? Email { get; set; }
}

What am I doing wrong?)