[RESOLVED] .NET Core Razor Page(Identity) - Employing a second model and db update

[HailMary]

Good day/evening,

I'm using Microsoft Identity as part of my MVC web application solution and allowing users to upload a mobile phone number.

The issue I am having is in the implementation of the verification process. What I did was to create a second OnPost method where I would like to save some system generated values to the db. My preference is to not implement a page model for these values as they will never factor in in the page lifecycle. The OnPost method I mentioned will upload these values to a non-identity-related table to the db, send an email, then redirect to another page where the user will enter a phone code to confirm authenticity.

My issue is the phone Model that is tied to the page. I'm using dependency injection to save the phone number, but I can't seem to be able to implement a solution that will upload the values to the new table I described. See the following snippets of code:

phone.cshtml.cs

public class PhoneModel(UserManager<IdentityUser> userManager, IConfiguration iConfig) : PageModel
{
    private readonly UserManager<IdentityUser> _userManager = userManager;
    private readonly IConfiguration _config = iConfig;

    private readonly ApplicationDbContext _db;
    public VerifyMobilePhone verifyMobilePhone { get; set; }

    public VerifyMobilePhoneModel(ApplicationDbContext db)
    {
        _db = db;
    }

    [BindProperty]
    public InputModel Input { get; set; }

    public class InputModel
    {
        [Display(Name = "Phone number")]
        [RegularExpression(@"\(\d\d\d\) \d\d\d - \d\d\d\d")]
        public string PhoneNumber { get; set; }
        public bool PhoneNumberConfirmed { get; set; }
    }

private async Task LoadAsync(IdentityUser user)
{..ok..}

public async Task<IActionResult> OnGetAsync()
{..ok..}

public async Task<IActionResult> OnPostUpdatePhone()
{..ok..}

public async Task<IActionResult> OnPostSendPhoneCode()
{
    var salt = **Generate Salt**
    var phoneVerifyCodeHash = **Generate Phone**
    var user = await _userManager.GetUserAsync(User);


**THIS IS WHERE I WANT TO UPLOAD THESE 3 FIELDS TO THE NEW TABLE IN MY DB**

   **Redirect to Phone code input page**
}

The area that's highlighted red is giving me the following error to which I am unable to resolve:
"CS8862: A constructor declared in a type with parameter list must have 'this' constructor initializer."

I am unable to figure out how to tackle this issue.

Any pointers?

Thanks,
Kenobi