Problem in Integration of Graph API

Question

I am trying to get emails from sentItems folder.
For testing Purposes I am using Postman client.

I am successfully getting access token by using "https://login.microsoftonline.com/common/oauth2/token"
but when I use this access token for "https://graph.microsoft.com/v1.0/me/mailFolders/SentItems/messages?"
I am getting this error
"/me request is only valid with delegated authentication flow." .

Attaching SS of permissions.

Answer 1

You seem to be using application permissions to access /me. /me end point and its extensions like /me/mailFolders/SentItems/messages require a signed in user ie delegated permissions. Acquire a token using delegated permissions and try again.

See Auth Code Flow which will include the delegated permissions in your token.
See Permission types on the difference between delegated and application permissions.