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When I connect to SharePoint online using SharePointOnlineCredentials what type of authentication am I using? I don't think it is oauth.

Also the legacy authentication is being discontinued by MS. So will this way still work after that?

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For how this will work, you will register an Azure AD app with the appropriate Graph API permissions (there is also the v1 API which uses Client ID/Secret, registered in SharePoint itself).

See Using CSOM for .NET Standard instead of CSOM for .NET Framework.

See SharePoint authentication for how SharePoint Online auth is performed. Essentially, you're issued a FedAuth cookie.

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  • When passing the user and pwd to the clientcontext no browser interaction is present. Am I using oauth in this scenario or Federated authentication with AAD as the IDP? How does this relate to the legacy authentication setting in my tenant? – Danny Nov 11 '20 at 15:50
  • Disabling Legacy Auth (which you should do along with disabling App Passwords) prevents the use of non-modern authentication mechanisms. But programmatically you shouldn't be using username/password, at least for non-interactive scenarios. – Trevor Seward Nov 11 '20 at 16:04
  • We are using Azure AD app registrations for our non interactive stuff. I'm building a test case because we are having issues with PnP-PowerShell using the credential manager. When we execute a specific cmdlet and use the credential manager we get invalid refresh token errors. PnP also uses username and password from credential manager to build the clientcontext. So I want to test it using plain CSOM. I was just looking how authentication goes when using CSOM and passing SharePointOnlineCredentials. – Danny Nov 11 '20 at 18:56

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