OrganizationFromTenantGuidNotFound

Question

I have an app registered on Azure (free plan), which I want to use to read the emails from the Outlook inbox, with PHP. I set these permissions in order to be able to query the Graph API:

I have successfully redeemed an access token from my PHP app. With this token, I get a successful response on https://graph.microsoft.com/v1.0/users/{id}:

{
    "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users/$entity",
    "businessPhones": [],
    "displayName": "My Display Name",
    "givenName": "My Name",
    "jobTitle": null,
    "mail": null,
    "mobilePhone": null,
    "officeLocation": null,
    "preferredLanguage": "en",
    "surname": "My Surname",
    "userPrincipalName": "...@....onmicrosoft.com",
    "id": "aaaaaaaa-bbbb-cccc-..."
}

The scope of this token is also suitable for what I need:

However, when I want to query https://graph.microsoft.com/v1.0/users/{id}/mailfolders/inbox/messages?$orderby=receivedDateTime DESC for instance, I get this response:

{
    "error": {
        "code": "OrganizationFromTenantGuidNotFound",
        "message": "The tenant for tenant guid 'aaaaaaaa-bbbb-cccc-...' does not exist.",
        "innerError": {
            "oAuthEventOperationId": "27e88783-1c1e-48f7-be98-f555a5332497",
            "oAuthEventcV": "RkY2sv+z7pLFXJ0v7Oa18Q.1",
            "errorUrl": "https://aka.ms/autherrors#error-InvalidTenant",
            "requestId": "9565f55c-71b9-4885-a61f-746caed65588",
            "date": "2023-03-18T15:23:24"
        }
    }
}

I did an extensive search about this error, but found nothing. One answer I found states that I need a "need a Microsoft office 365 account with a subscription". The plan I currently use is free. It also prompts me to buy Microsoft 365:

Is this a limitation of the free plan, which denies me the ability to read emails through the Graph api?

Or is there something wrong I'm doing?

Answer 1

Hi @Site Salt

Error 401 Unauthorized 'OrganizationFromTenantGuidNotFound' generally occurs when your Azure AD does not have Office 365 account to work.
As per the last screenshot, the account which you are trying to access is not present in your tenant. Please make sure, user which you are trying to access is present in your tenant and have valid subscription.

Also, to get Mailbox of User (if not shared) you need to use Application permissions.

Hope this helps.

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