Using CSOM for .NET Standard, and MFA is enabled

Question

i follow this docs for sharepoint online dev
https://learn.microsoft.com/en-us/sharepoint/dev/sp-add-ins/using-csom-for-dotnet-standard
and MFA is enabled in my env
the result of the function : httpClient.PostAsync() is

ValueKind = Object : "{"error":"interaction_required","error_description":"AADSTS50076: Due to a configuration change made by your administrator, or because you moved to a new location, you must use multi-factor authentication to access '00000003-0000-0ff1-ce00-000000000000'.\r\n

as far as i know, app password can work in .net framework 4.6.1 with MFA
so my question is how to connect to sharepoint online, which MFA is enabled, based on .net core 3.1 ?

Answer 1

Hi justin-jia,

App Password can't be used in .NET Core solution (.NET Framework solution works).

A workaround is to use Azure AD App-Only credential with PnP.Framework library, here is a blog with the configuration steps and code demo for your reference:

Calling SharePoint Online APIs using Azure AD App-Only permissions and certificate auth

Here are some points to note:

1. It's necessary to create certificate for Azure AD App for authentication, ClientSecret method has been blocked by SharePoint Online currently.
2. Before installing PnP.Framework, please install PnP.Core with this command firstly:

       Install-Package PnP.Core -Version 0.6.6-beta3
     
        Then install PnP.Framework:
      
      
       Install-Package PnP.Framework -Version 1.2.0
   

3. The old SharePointPnPCoreOnline is archived and not complicate with .NET Core solution, so please don't use it for MFA Authentication.

Here is the test result capture in .NET Core solution:

Thanks
Best Regards

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Answer 2

hi @Jerryzy-MSFT thanks for your response. it work for me. i have another question, there is only sharepoint permissions, i also need project permissions. will project permissions be available in the future ? ![73599-image.png][1] [1]: /api/attachments/73599-image.png?platform=QnA

Answer 3

hi @Jerryzy-MSFT

got it

thanks again