You cannot mix two different geometry models. What you are essentially doing is assigning one type to a completely different type, which naturally isn't allowed. You will need to write some code that converts PolygonN into Client.Geometry.Polygon.
Signed in members can post, follow updates, and more. New here? Register a free account.
Find useful guides, FAQs, and documents to help you navigate and make the most of Esri Community.