Graph API not recognizing user

Question

I have been trying to access my inbox via the Graph API, I have registered an app on the azure portal and the API permissions have been granted. The problem is every time I try to access my inbox via my Laravel project to this endpoint "https://graph.microsoft.com/v1.0/users('******@zynle.com')/mailFolders/inbox/messages" I get an error saying:

{
    "error": {
        "code": "ErrorInvalidUser",
        "message": "The requested user '******@zynle.com' is invalid.",
        "innerError": {
            "date": "2023-02-21T12:51:14",
            "request-id": "620119c6-0988-4f2a-815a-4307cdeec499",
            "client-request-id": "620119c6-0988-4f2a-815a-4307cdeec499"
        }
    }
}

yet on my azure portal, the account "******@zynle.com" is the one I used to register the Application. Below are the API permissions that I have granted :

I am able to get an access token, The only part I get issues with is reading the outlook inbox.
Please help me I've been at this for a while.

Answer 1

Hello Norris Mwiinga,

Thanks for reaching out!

The mentioned error message code tells that the user is invalid or doesn't exist.

1. Make sure the user exists in portal.office.com. I'm able to replicate the error message when I'm passing wrong UPN (non-existing user UPN).
2. If the user exists, using this endpoint GET https://graph.microsoft.com/v1.0/users, you can query all the users in your tenant. In the response, the response contains id and userPrincipalName that can be used to request the /messages endpoint.
3. Make sure the token has right permissions/scopes to access the user's mailbox.
4. Split the application calls into smaller modules and check where it's breaking.

You can refer to this documentation to get a token.

Hope this helps.
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Answer 2

Does this work?

https://graph.microsoft.com/v1.0/me/messages

What is the primary SMTP address of the account? Does it match the user logon of ******@zynle.com

Answer 3

Hi @Norris Mwiinga

Try changing the UPN to the user's object id to call that endpoint:

https://graph.microsoft.com/v1.0/users/{user id}/mailFolders/inbox/messages

Hope this helps.

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