title: HTTP 429 from Microsoft Graph API requests
body: <p>We have a third-party Azure AD application which uses the Microsoft Graph API. This application has not been changed in Production for around 2 months, and we have not had any issues so far.</p>
  
  <p>Since this morning, I am unable to login to the application due to <code>HTTP 429</code> responses on requests to the Office 365 Graph API. This is happening to requests on both <code>/messages</code> and <code>/people</code> endpoints. See below screenshot of developer console:</p>
  
  <p><a href="https://i.stack.imgur.com/57TyZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/57TyZ.png" alt="devconsole"></a></p>
  
  <p>Would someone be able to advise if there have been any recent changes to the throttling limits on the Graph API?</p>
  
  <p>I don't understand why this would suddenly start happening when there have been no production changes to our application for months.</p>