Office.js web add-in throws HTTP 401 Unauthorized

One of my dev customer, created Outlook Web add-in (using Office.js/JavaScript) and tried calling EWS call (mailbox.makeEWSRequestAsync method). It throws HTTP error 401 for mailbox.makeEWSRequsetAsync() method. They noticed the error or behaviour when they tested with Outlook on the Web and Outlook Web Access for devices. The API call throws, the following HTTP error: “The…

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Cloud Developer: Office 365 REST API returns 401 access denied with an error code of “invalid_token”

In recent times i worked with this cloud developer (Azure AD, Office 365 REST API) where they created a custom application. It uses (Calendar, Contact, Mail APIs) to pull items from the specified user mailbox. Intermittently they see “401 Access Denied” followed by error code “invalid_token” from the API. During the investigation, we noticed that…

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