'ClientWebSocketOptions' does not contain a definition for 'RemoteCertificateValidationCallback' and no accessible extension method 'RemoteCertificateValidationCallback' accepting a first argument of type 'ClientWebSocketOptions' could be found (are you missing a using directive or an assembly reference?)
'ClientWebSocketOptions' does not contain a definition for 'RemoteCertificateValidationCallback' and no accessible extension method 'RemoteCertificateValidationCallback' accepting a first argument of type 'ClientWebSocketOptions' could be found (are you missing a using directive or an assembly reference?)