Create meeting with makeEwsRequestAsync having on behalf of functionality in Outlook add-in (for Windows) RRS feed

  • Question

  • We are trying to create a meeting from an Outlook web add-in using makeEwsRequestAsync with on behalf of functionality. The request works great on Outlook for Mac, but on Outlook for Windows it returns this error message: "Office extension have no permissions to access any other mailboxes then the mailbox provided in the user context."

    I have added permissions to the delegated person from Outlook and also as admin user from

    Is there something we need to configure?

    The request we used is the following:

    <?xml version="1.0" encoding="UTF-8"?>
            xmlns:v="" xmlns:c=""
            xmlns:d="" xmlns:i="">
            <n0:RequestServerVersion xmlns:n0=""
            <CreateItem xmlns=""
                    <n1:DistinguishedFolderId xmlns:n1=""
                    <n2:CalendarItem xmlns:n2="">
                        <n2:Subject>Quick Meeting</n2:Subject>
                        <n2:Body BodyType="HTML">&lt;html&gt;&lt;body&gt;Booked with Outlook add-in. &lt;/body&gt;&lt;/html&gt;

    Tuesday, January 15, 2019 9:48 AM