title: Offic365 : "Invalid_Grant" response is received every 15days
body: <p>Every 15 days we are receiving "invalid_grant" response when our application tries to retrieve Contacts/Calendar Events from Office 365. We have verified the settings and password policy is set to default value (90) and application authorization is not revoked from Office 365 account. Adding to this User password is not changed manually. </p>
  
  <p>So any specific reason for this behavior?</p>