So these are the steps I followed on Postman using the Microsoft Graph collection and I am able to get the profile photo:
- ensure you have set up Microsoft Graph collection on your postman. Please refer to this short video on how to do so if you haven't yet.
- open a new tab on Postman and add a GET request as https://graph.microsoft.com/v1.0/me/photo/$value then click on the save button.
- on the 'save request' dialog box, save the new request under the 'OnBehalf of a User' in the Microsoft Graph collection
- go to the Authorization tab and click on the 'On Behalf of a User'
- Click on 'Get New Access Token' then login as a user then click on 'Proceed' after which, click on 'Use token'
- The dialog box will close then click on send and you should get the profile photo.
Give this a try and let me know how it goes