 <p>Found the answer. I referred the below link : <a href="http://www.gunaatita.com/Blog/Invalid-Token-Error-on-Email-Confirmation-in-Aspnet-Identity/1056" rel="nofollow">http://www.gunaatita.com/Blog/Invalid-Token-Error-on-Email-Confirmation-in-Aspnet-Identity/1056</a></p> <p>It was due to the machine key generated by Web API and MVC. Configuring the same machine key on both Web API and MVC solved the 'Invalid Token' issue.</p>