Can't send email using Graph API

Question

I can't send email with Graph API whether using application or delegated permission

The account used is personl

When trying with Graph Explorer it succeeds, but failure occurs when using Postman

The response code is always 401

Answer 1

Hi Osema MEKELLECHE,

Thanks for reaching out to Microsoft!

401 error indicates that the access token is either missing, invalid, or expired.

As mentioned in the document, make sure that your application is presenting a valid access token to Microsoft Graph as part of the request. We strongly recommend that you use the Microsoft Authentication Library (MSAL) for access token acquisition.

Decode token, scp (scope) or roles: Should include the permissions your app needs, like "Mail.Send". 

Hope this helps.

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Answer 2

Hi @Osema MEKELLECHE

Personal accounts do not support application permissions, only delegated permissions. In addition, you need to make sure your application has been configured to allow personal accounts to log in.

Then, use the auth code flow to perform authentication for the personal account, and change /{tenant_id} to /common.

"https://login.microsoftonline.com/common/oauth2/v2.0/authorize"

"https://login.microsoftonline.com/common/oauth2/v2.0/token"

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Hope this helps.

If the reply is helpful, please click Accept Answer and kindly upvote it. If you have additional questions about this answer, please click Comment.