401 on graph /sendMail API

Question

401 on graph /sendMail API

Kiril Arsov 5

I have successfully obtained oAuth access token using https://login.microsoftonline.com/78b89706-c3e7-496a-ae39-eed396f02f11/oauth2/v2.0/token

I have successfully used this token to obtain users using https://graph.microsoft.com/v1.0/users

But when I try to sendEmail using https://graph.microsoft.com/v1.0/users/3fcfc7ec-239b-40d6-bd94-b637b4d8c2b6/sendMail I always get 401

I have registered an application with the required permissions:

Mail.SendApplicationMail.SendApplicationwhen extracting the token I see the permissions are there.

Sridevi Machavarapu 4,610 Reputation points Volunteer Moderator

2025-05-16T01:46:21.4166667+00:00

Hello Kiril Arsov,

Could you please check and confirm whether that user is a guest user in your tenant using personal Microsoft account or having active license or not? Please share the Overview page of that user from Portal in Private messages window.

1 answer

Your answer

Sridevi Machavarapu 4,610 Reputation points Volunteer Moderator

2025-05-16T01:46:21.4166667+00:00

Hello Kiril Arsov,

Could you please check and confirm whether that user is a guest user in your tenant using personal Microsoft account or having active license or not? Please share the Overview page of that user from Portal in Private messages window.

Answer 1

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