Forum Discussion
Microsoft Graph API using for external user
We have been working with the Microsoft Graph API to fetch the mail list of an external user using the following endpoint: https://graph.microsoft.com/v1.0/me/messages. However, we are encountering a...
Guest cannot have a mailbox within the resource tenant, thus no messages will be returned. If you want to fetch messages in the user's actual mailbox in his home tenant, your application must be added therein and you should obtain a token for the user with audience set to the home tenant.