msgraph-sdk-dotnet | Microsoft Graph Client Library for .NET

I would like to integrate the Planner feature of Teams into a custom C++/Qt application. I'm not familiar with writing bindings C# <-> C++, so I'm exploring the possibility to use an external process that communicates with Microsoft Graph. I'm going to build this process with the C# Graph SDK.

Question: Is it possibile to avoid authentication every time I launch the process? Since I'm going to spawn this process many times (ie. each time I need to access Graph info) I want to avoid authenticating each time.

I've tried using Microsoft authentication extensions for .NET, and while the sample application seems to be working fine, I can't figure out how to connect it with the GraphServiceClient class.

I am using this library (Microsoft Graph .NET client library) in my project to retrieve emails from my mailbox. However, when I try to filter messages from my mailbox by createdDateTime or body, I get a "Bad Request" error. Here are my requests:

I understand that based on the documentation here that with the C# Graph SDK library I can continue requesting the next page of results until NextPageRequest == null, but I was wondering if I could save the NextLink I get back and if I encounter an error, the next time this is executed, I could resume at the place I was at using the NextLink (using the C# SDK library).

I haven't been able to find anything in the documentation around this. Is this perhaps something I could do with the RequestBuilder?

I'm currently doing a small poc on Microsoft Graph API by following the tutorial here but facing an issue where AuthorizationCodeProvider could not be found. I've installed all the necessary packages and all. What am I missing?

I actually have two questions which may possibly be related:

Question 1: Why does user personal email address appear in Azure portal as User Principal Name?

Question 2: How do I look up a user by their personal email address?

The email address I will be looking for is the one used as a sign in name so I expect that it should appear in a property like signInNames as is mentioned below.

Steps to reproduce:

Log into Azure portal, Look at a random user and observe their User Principal Name. Note it appears in the format of a personal email address (joe@somedomain.com). Copy the users Object ID.

In code, create a new GraphServiceClient and retrive the user by object ID using the Object ID copied in the step above.

I am trying to read a person's Out of Office text with MSGraph. I understand the only way to do this is by getting the person's mailbox settings as indicated here.

Is there another way to read a person's Out of Office Message?

Assuming there is no other way I then have read for example in this link that to call GET /users/{id|userPrincipalName}/mailboxSettings you need to have Application Permissions for MailboxSettings.Read, MailboxSettings.ReadWrite. Is this still the case? It does not make sense to me that you need Application level permissions. Is there not a delegated (admin consent required) MailboxSettings.Read.All??? The problem is that most IT departments will be hesitant (or pigs are going to fly before some IT departments) give an application this permission to run without a signed in user.

Alternatively, I see that there is a User property of mailboxsettings, thus using the $select query parameter you can call this https://graph.microsoft.com/v1.0/users/{id}?$select=mailboxSettings does or should this work with the User.Read.All.

UPDATE in accordance with the suggestion below I have added 2 suggestions to the MSGraph user voice.

1. A person's out of office information should be included with their calendar / freebusy (getschedule) information.
2. There should be a Mailboxsettings.Read.All permission.

Please click on the link and vote them up if you agree.

Is there way to set MaxRetry value when we use msgraph-sdk-dotnet-auth as authentication Providers. I could see it has set to 1 in AuthenticationProviderOption class

I need to unit test Test1() as below and have to mock msgraph-sdk create event which has http call.
I was mocking Request() and AddAsync( ) methods but got null value on Act.
What is the correct way to unit test CreateAsync by mocking ?

My application can upload files into OneDrive, SharePoint normally by Consecutive Upload. For now, It is broken, and throw InternalServerError when calling