Reset a user's password using microsoft.identity

I need for a manager to set a user's password on request.  I can reset the password, but the user still can't log in.  I have provided the code I am using below:

        [HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> ResetPassword(ResetPasswordViewModel model)
        {
            if (!ModelState.IsValid)
            {
                return View(model);
            }
            var user = await UserManager.FindByNameAsync(model.UserName);
            if (user == null)
            {
                // Don't reveal that the user does not exist
                return RedirectToAction("ResetPasswordConfirmation", "Account");
            }

            
            string resetToken = await UserManager.GeneratePasswordResetTokenAsync(user.Id);

            var result = await UserManager.ResetPasswordAsync(user.Id, resetToken, model.Password);
            if (result.Succeeded)
            {
                using (var db = new RPIADbContext())
                {
                    var id = user.Id;
                    var usr = db.AspNetUsers.Find(id);
                    usr.MustChangePassword = true;

                    db.AspNetUsers.Attach(usr);

                    db.Entry(usr).Property(x => x.MustChangePassword).IsModified = true;
                    db.SaveChanges();
                }
                ViewBag.IsEdit = 1;
                return RedirectToAction("ResetPasswordConfirmation", "Account");
            }
            AddErrors(result);
            return View();
        }

        //
        // GET: /Account/ResetPasswordConfirmation
        [AllowAnonymous]
        public ActionResult ResetPasswordConfirmation()
        {
            var currentUserId = User.Identity.GetUserId();
            var cu = _db.AspNetUsers.Find(currentUserId);
            if (cu.Role == "Admin" || cu.Role == "Chief" || cu.Role == "Manager" || cu.Role == "Sergeant")
            {
                ViewBag.IsEdit = 1;
            }
            else
            {
                ViewBag.IsEdit = 0;
            }


            return View();
        }

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After manager resets password, the user is forced to change their password ... but the user can't log in, just gets invalid login attempt error.