I am new to MVC 5 authentication. Currently I tried Google Authorization using Owin The code in startup.Auth.cs
var googleOAuth2Authenticati
Try the same code but change the CallbackPath to /umbraco/surface/UmbracoIdentityAccount/LinkLoginCallback and register it in the Authorized redirect URIs in your app.
CallbackPath
/umbraco/surface/UmbracoIdentityAccount/LinkLoginCallback