Microsoft Graph API mailboxes are configured differently from other protocols. For other protocols, user credentials are entered for each mailbox configuration. For Graph API mailboxes, however, you enter your security credentials in the External APIs page only. The credentials are not entered in the Segment Mailbox configurations pages. When using Graph API, the first step is to create an application within your Azure configuration that will contain the various mailboxes. You will used the values created from that setup to complete the settings shown below.

Settings for Microsoft Graph API

The values for 1,2, and 3 are provided by your IT administrator. These values must be entered before any of your Graph API mailboxes may be used.