"Access is denied. Check credentials and try again" error getting when try to send an email

Question

Hello! I am begging for help with sending an email.
I am using Graph API for getting and sending email
I have the following permissions granted.

Please note that I need to send an email only as an authorized user with delegated permission, not with application permission.
With getting an email all good (hence I can say that the auth token is correct most likely). But when I am sending mail I get the error - "

Access is denied. Check credentials and try again.

My URL :
My URL :https://graph.microsoft.com/v1.0/users/******@gmail.com/sendMail

My body:

{
    "message": {
        "subject": "Meet for lunch? 2 ",
        "body": {
            "contentType": "Text",
            "content": "The new cafeteria ifsdfsdfss open."
        },
        "toRecipients": [
            {
                "emailAddress": {
                    "address": "******@gmail.com"
                }
            }
        ]
    }
}

My header:

Please lend me your wisdom.

Answer 1

Hi @Katya Fedorova

In the context of delegation, you can only send mail on behalf of the logged-in user (/me) and not other users. Before doing so, make sure you have obtained an access token using the delegated authentication flow (auth code flow or ROPC flow).

Hope this helps.

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Answer 2

Hello Katya,

Good day and thank you for the question. Can I please know if you're using user: sendMail? I also noticed that you're using "******@gmail.com". You may need to use [id] or [userPrincipalNam] under Exchange Online.

For testing purposes, try using Graph Explorer and use sendMail endpoint using /me/sendMail and verify if it works.