Active Directory `thumbnailPhoto` and `jpegPhoto`

Question

I need to write via C# the user profile pictures into the Active Directory. First I tried using the DirectoryServices setting the two properties thumbnailPhoto and jpegPhoto to the DirectoryEntry object. Because on some users I got Access Denied I tried using Microsoft Graph SDK API as followings:

byte[] bytes = File.ReadAllBytes(path);

using (MemoryStream stream = new MemoryStream(bytes))
{
    await _client.Users[user.Id].Photo.Content.PutAsync(stream);
}

where the loaded stream is byte[1743117].

Using this approach it works fine, but getting the image as following, returns a reduced version, 100x100, in other words, the thumbnail:

await _client.Users[user.Email].Photo.Content.GetAsync()

Then I noticed that pics are automatically synched to SharePoint Online, Exchange, but not to Teams, so I am wondering how all the magic works behind the curtains.

Furthermore, if I query the Active Dirctory again as followings:

using (DirectorySearcher dsSearcher = new DirectorySearcher())
{
    dsSearcher.Filter = "(&(objectClass=user) (mail=aMail))";
    SearchResult? result = dsSearcher.FindOne();

    if (result != null)
    {
        using (DirectoryEntry user = new DirectoryEntry(result.Path))
        {
            user.Properties["jpegPhoto"];
            user.Properties["thumbnailPhoto"];
        }
    }
}

jpegPhoto is byte[507251] and thumbnailPhoto is byte[4994]

In the end what I need is:

• To write the images into AD, or somewhere the images are automatically sent to SharePoint Online, Exchange, Teams and all MS products.
• Somehow get these images from AD in their original form or at lease in a decent quality.

Answer 1

As mentioned by @Gabriel Luci, Ms Graph resizes the picture.

The problem accessing the active directory properties was due to permissions. In fact, the permissions write all properties is required.