Microsoft Graph API: 'Tenant does not have a SPO license' Error when Accessing SharePoint Site with valid business o365 account

I am attempting to access a SharePoint site using the Microsoft Graph API from a Python script. Despite having granted the necessary permissions in Azure AD and assigning licenses, I keep encountering the following error:

Failed to get site ID. Status code: 400

{
    'error': {
        'code': 'BadRequest',
        'message': 'Tenant does not have a SPO license.',
        'innerError': {
            'date': '2024-05-22T12:52:33',
            'request-id': 'cd207c1f-5bbc-435d-b6e3-94170d9e6aff',
            'client-request-id': 'cd207c1f-5bbc-435d-b6e3-94170d9e6aff'
        }
    }
}

Azure AD App Registration:

• Created an app registration and granted Sites.ReadWrite.All and Files.ReadWrite.All permissions.
• Admin consent has been granted for these permissions.

SharePoint Permissions:

• Added the app with the following permission request XML at https://*.sharepoint.com/sites/Document_Repository/_layouts/15/appinv.aspx:

<AppPermissionRequests>
    <AppPermissionRequest Scope="http://sharepoint/content/sitecollection" Right="FullControl" />
</AppPermissionRequests>

Licenses:

• Verified that the tenant has SharePoint Online licenses available.
• Assigned SharePoint Online licenses to the users.

Python Script:

• Using msal library to acquire an access token and making requests to the Microsoft Graph API.
• This is my endpoint (Document_Repository is my SharePoint site I want to hit) https://graph.microsoft.com/v1.0/sites/*.sharepoint.com:/sites/Document_Repository