Access SharePoint Online with AzureAD APP authentication from .Net core 3.1 Console application

Question

Hi Masters,

In a new solution we need to access SharePoint Online Site with CSOM. The application is .net Core 3.1 based, and we have to user AzureAD to access SharePoint. So I have created an App (App Registration) in Azure, created a Client Secret, and get AccessToken from AAD.

But SharePoint Online sends 401 back.

Using ClientCertificate to get AccessToken the connection is working.

Is there a way to use ClientSecret to access SharePoint?

Regards,
Zoli

Answer 1

Hi @KrolyiZoltn-0660 ,

Currently, Azure AD App Client Secret authentication option is blocked by SharePoint Online, so it's not available to use Client Secret, it's necessary to use Certificate instead:

Please check the official documetation for detailed information:

Granting access via Azure AD App-Only

And here is a demo to get acess token with Azure AD App Certificate in CSOM, I suggest that you can refer :

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

Thanks
Best Regards

---

If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.