graphClient.Me.GetAsync() / graphClient.Users.GetAsync() can't get AdditonalData from Type "#Collection(String)"

[jcraft123]

Describe the bug

Hello,
I'm trying to retrieve some Entra ID directory extensions from users using the Graph SDK. It works with normal strings, but if I have an array as data type, it just displays an empty object.

If I use the following code block:
var me = await graphClient.me.GetAsync(requestConfiguration => { requestConfiguration.QueryParameters.Select = new string[] { "Id", "extension_c4eaf7e0c68a468c8a93aa91dc1cdf8e_roomNumber", "extension_c4eaf7e0c68a468c8a93aa91dc1cdf8e_info" }; });

I receive:
{ "AdditionalData": { "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users(id,extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_roomNumber,extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_info)/$entity", "extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_roomNumber@odata.type": "#Collection(String)", "extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_roomNumber": {}, "extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_info": "11 IT 04 Anwendungsdienste - Kollaboration" }, "BackingStore": { "InitializationCompleted": true, "ReturnOnlyChangedValues": false }, "Id": "c959de31-XXXX-XXXX-XXXX-276f63552369", "OdataType": "#microsoft.graph.user" }

Expected behavior

I expect all the values to be displayed as if I go directly to the HTTP API.
URL: https://graph.microsoft.com/v1.0/me?$select=id,extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_roomNumber,extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_info

Output:
{ "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users(id,extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_roomNumber,extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_info)/$entity", "id": "c959de31-XXXX-XXXX-XXXX-276f63552369", "extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_roomNumber@odata.type": "#Collection(String)", "extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_roomNumber": [ "E.6.160" ], "extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_info": "11 IT 04 Anwendungsdienste - Kollaboration" }

How to reproduce

var graphClient = new GraphServiceClient(credential, scopes); var me = await graphClient.Me.GetAsync(requestConfiguration => { requestConfiguration.QueryParameters.Select = new string[] { "Id", "extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_roomNumber", "extension_c4eaxxxxxxxxxxxxxxxxaa91dc1cdf8e_info" }; }); Console.WriteLine(JsonSerializer.Serialize(me!));

SDK Version

5.78.0

Latest version known to work for scenario above?

5.46.0

Known Workarounds

No response

Debug output

No response

Configuration

-OS: Windows 11
-Architecture: x64
-IDE: Visual Studio 2022 17.14.0

Other information

No response