ASP.NET MVC OpenIdConnect OnAuthorizationCodeReceived not triggering after app restart - asp.net

Question

I work in a corporate and we have got an AAD for all the users in our organisation.
I am working on creating an app that authenticates users with AAD using OpenIdConnect. Now, I have followed this sample from Azure AD B2C. it works fine when I run it locally for the first time (after an hour break) and OnAuthorizationCodeReceived is triggered, however, when I stop and restart the app in visual studio OnAuthorizationCodeReceived doesn't get triggered and as a result, I get a null User (IAccount) when trying to retrieve token silently in this code block
public async Task<string> GetAccessToken(string scopes)
{
//var userClaims = User.Identity as System.Security.Claims.ClaimsIdentity;
var userClaims2 = ClaimsPrincipal.Current.Claims;
IConfidentialClientApplication cc = MsalAppBuilder.BuildConfidentialClientApplication();
var userAccount = await cc.GetAccountAsync(ClaimsPrincipal.Current.GetMsalAccountId());
var userAccount2 = await cc.GetAccountsAsync(ClaimsPrincipal.Current.FindFirst(Globals.ObjectIdClaimType).Value);
var userAccount3 = userAccount2.FirstOrDefault();
AuthenticationResult result = await cc.AcquireTokenSilent(new string[] { scopes }, userAccount3).ExecuteAsync();
return result.AccessToken;
}
My startup.Auth file looks like this:
public void ConfigureAuth(IAppBuilder app)
{
app.SetDefaultSignInAsAuthenticationType(CookieAuthenticationDefaults.AuthenticationType);
app.UseCookieAuthentication(new CookieAuthenticationOptions());
// Configure OpenIDConnect, register callbacks for OpenIDConnect Notifications
app.UseOpenIdConnectAuthentication(
new OpenIdConnectAuthenticationOptions
{
// Sets the ClientId, authority, RedirectUri as obtained from web.config
ClientId = ConfigHelper.ClientId,
Authority = String.Format(CultureInfo.InvariantCulture, aadInstance, ConfigHelper.Tenant),
PostLogoutRedirectUri = ConfigHelper.PostLogoutRedirectUri,
RedirectUri = ConfigHelper.PostLogoutRedirectUri,
ResponseType = OpenIdConnectResponseTypes.CodeIdToken,
// ValidateIssuer set to false to allow work accounts from any organization to sign in to your application
// To only allow users from a single organizations, set ValidateIssuer to true and 'tenant' setting in web.config to the tenant name or Id (example: contoso.onmicrosoft.com)
// To allow users from only a list of specific organizations, set ValidateIssuer to true and use ValidIssuers parameter
TokenValidationParameters = new Microsoft.IdentityModel.Tokens.TokenValidationParameters()
{
ValidateIssuer = true
},
Notifications = new OpenIdConnectAuthenticationNotifications
{
RedirectToIdentityProvider = (context) =>
{
//string redirectURI = string.Format("{0}://{1}{2}/", context.Request.Scheme, context.Request.Host, context.Request.PathBase);
string redirectURI = string.Format("https://{0}{1}/", context.Request.Host, context.Request.PathBase);
context.ProtocolMessage.RedirectUri = redirectURI;
context.ProtocolMessage.DomainHint = domain_hint;
return Task.FromResult(0);
},
AuthorizationCodeReceived = OnAuthorizationCodeReceived,
AuthenticationFailed = (context) =>
{
if (ConfigHelper.NonceExceptionHandler && (context.Exception.Message.StartsWith("OICE_20004") || context.Exception.Message.Contains("IDX10311") || context.Exception.Message.Contains("IDX21323")))
{
context.SkipToNextMiddleware();
return Task.FromResult(0);
}
return Task.FromResult(0);
}
}
});
app.Use<MsOfficeLinkPrefetchMiddleware>();
// add this function into the app pipeline to Call my function OnAuth and call the next in the pipeline
app.Use((context, next) =>
{
// The function to call...
OnAuth(context);
return next.Invoke();
});
// limit the calls to the above function to be in the PostAuthenticate part of the stage
app.UseStageMarker(PipelineStage.PostAuthenticate);
}
private Task OnAuthenticationFailed(AuthenticationFailedNotification<OpenIdConnectMessage, OpenIdConnectAuthenticationOptions> context)
{
context.HandleResponse();
context.Response.Redirect("/?errormessage=" + context.Exception.Message);
return Task.FromResult(0);
}
private async Task OnAuthorizationCodeReceived(AuthorizationCodeReceivedNotification notification)
{
string redirectURI = string.Format("{0}://{1}{2}/", notification.Request.Scheme, notification.Request.Host, notification.Request.PathBase);
IConfidentialClientApplication confidentialClient = MsalAppBuilder.BuildConfidentialClientApplication(new ClaimsPrincipal(notification.AuthenticationTicket.Identity));
// Upon successful sign in, get & cache a token using MSAL
//user.readbasic.all
AuthenticationResult result = await confidentialClient.AcquireTokenByAuthorizationCode(new[] { "user.readbasic.all" }, notification.Code).ExecuteAsync();
}
I have been trying for a few days to solve this problem but to no avail. Please Help.
Cheers