Forum Discussion
'AuthenticationManager' does not contain a constructor that takes 0 arguments
I have the following code to connect to SharePoint using clientID and ClientSecret:- string siteUrl = "https://****l.sharepoint.com/sites/DocumentApprovalProcess/";
string clientId = "**...
The method you are trying to use is available in OfficeDevPnP.Core. You can install it from here.
Microsoft documentation: AuthenticationManager.GetAppOnlyAuthenticatedContext Method
You can check below reference to check how you can use this method:
Connect To SharePoint Online Site With App Only Authentication
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