Connecting from desktop app to SharePoint online

Question

We created a small desktop app (in c#) which reads and writes lists from SharePoint site, and it worked fine. But once we moved to SharePoint Online we can't connect with this SharePoint site. We get 401 UNAUTHORIZED message. We connect thru Graph API. What type of permissions we need to request and configure in this application?

Answer 1

Hi @Dariusz Roszak ,

According to my research and testing, we need to request one of the following permissions in this application: Sites.Read.All, Sites.ReadWrite.All, and the Permission type is ** Application **:

More information for reference:
Working with SharePoint sites in Microsoft Graph
Get a site resource

Hope it can help you. Thanks for your understanding.

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Answer 2

Dear Tong Zhang_MSFT,

thank you for the answer. We are analyzing it and will be back with confirmation of more questions.

Answer 3

Dear Tong Zhang_MSFT,

thank you for the response. It is really helpful. I am a little confused of permission type ‘application’ for mentioned desktop type app. Is the ‘Delegated (work or school account)’ permission would be also appropriate for our purpose, or ‘Application’ is the only option?