title: Microsoft Graph API Refresh Token Expired
body: <p>I have a web application integrated to Office 365 using Microsoft graph API. I have using the application for more than a year now. Lately I have been receiving an error stating the <strong>refresh token has expired due to inactivity</strong> hence I am not able to update that users subscription by 3 days.</p>
  
  <p>Now whenever an email hits the users inbox there is an exception in the listen state.</p>
  
  <p>below is the error message</p>
  
  <blockquote>
    <p>Error validating credentials. AADSTS70008: The refresh token has expired due to inactivity. The token was issued on 2017-02-16T19:08:12.3388232Z and was inactive for 90.00:00:00.</p>
  </blockquote>
  
  <p><a href="https://i.stack.imgur.com/0MxeW.png" rel="noreferrer">snippet of the error message</a></p>
  
  <p>Please help on how to fix this error</p>