Generate User Two Factor Security Code from Microsoft.AspNetCore.Identity

IMicrosoftAspNetCoreIdentityUtils.cs

using System.Threading.Tasks;
using BrunoMartinsPro.Data.Models;

namespace BrunoMartinsPro.Utils.MicrosoftAspNetCoreIdentity
{
    public interface IMicrosoftAspNetCoreIdentityUtils
    {
        Task<string> GenerateUserTwoFactorSecurityCode(ApplicationUser user, string securityType);
    }
}

MicrosoftAspNetCoreIdentityUtils.cs

using System.Threading.Tasks;
using Microsoft.AspNetCore.Identity;
using BrunoMartinsPro.Data.Models;

namespace BrunoMartinsPro.Utils.MicrosoftAspNetCoreIdentity
{
    public class MicrosoftAspNetCoreIdentityUtils : IMicrosoftAspNetCoreIdentityUtils
    {
        private readonly UserManager<ApplicationUser> _userManager;

        /// <summary>
        /// Register DI
        /// </summary>
        /// <param name="userManager"></param>
        public MicrosoftAspNetCoreIdentityUtils(UserManager<ApplicationUser> userManager)
        {
            _userManager = userManager;
        }

        /// <summary>
        /// UpdateSecurityStampAsync signs out all sessions and creates a new security stamp, this in turn generates a new code 
        /// </summary>
        /// <param name="user"></param>
        /// <param name="securityType"></param>
        /// <returns></returns>
        public async Task<string> GenerateUserTwoFactorSecurityCode(ApplicationUser user, string securityType)
        {
            //Sign out all sessions, generate a new security stamp to generate phone code
            await _userManager.UpdateSecurityStampAsync(user);

            //Get generated phone code
            var codePhoneConfirmation = await _userManager.GenerateTwoFactorTokenAsync(user, securityType);

            //Return generated phone code
            return codePhoneConfirmation;
        }
    }
}