ArcGIS Pro 2.8 API Reference Guide
ISignOnHandler Interface
Members 

ArcGIS.Core.SystemCore Namespace : ISignOnHandler Interface
CoreHost applications implement an ISignOnHandler to receive callbacks from the system whenever authentication is required for a portal or arcgis online.
Syntax
public interface ISignOnHandler 
Public Interface ISignOnHandler 
Remarks
The primary scenario for authentication is when a CoreHost application is instantiating a connection to a federated Feature Service DB that is secured.
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

ISignOnHandler Members
ArcGIS.Core.SystemCore Namespace