SharePoint 2013/2016/2019: Use CSOM in SharePoint Site with multiple authentication schemes

Scenario I have a SharePoint site collection which has multiple authentication schemes (say Windows NTLM, Azure AD, Okta, ADFS or any other 3rd party Identity provider) on same URL. Now when I try to connect to that site using CSOM, I will get below 403 forbidden error from SharePoint: The remote server returned an error: … Continue reading SharePoint 2013/2016/2019: Use CSOM in SharePoint Site with multiple authentication schemes