using (Microsoft.SharePoint.Client.ClientContext ctx = authman .GetAppOnlyAuthenticatedContext(appUrl, clientId, clientSecret)) gives 401 error

Question

We are using Azure AD App Only authentication in CSOM for MFA users with Client Id/Secret.

The code like this:

var authman = new OfficeDevPnP.Core.AuthenticationManager();
using (Microsoft.SharePoint.Client.ClientContext ctx = authman .GetAppOnlyAuthenticatedContext(appUrl, clientId, clientSecret))
{
  Web web = ctx.Web;
  context.Load(web, w => w.Id, w => w.Title);
  context.ExecuteQueryRetry();
}

Code works fine in last year, however today, it's returning "The remote server returned an error: (401) Unauthorized."

Any solution for this ?

Answer 1

Hi @developer sp1 ,
We can only use certificates for realizing app-only access for the Azure AD app, all other options are blocked by SharePoint Online and will result in an Access Denied message.
You could get this information here.

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