The .NET Diagram SDK does not use the same RestSharp Version as Cells SDK. This makes it currently not possible to use them together in the same project. Binding Redirects cant be used, or at least i dont know how. Are there any ways to make this work? Can you update the Diagram SDK?
We have tested both .NET SDKs in a C# project and noticed the reported issue. So logged a ticket DIAGRAMCLOUD-97 to fix the issue. We will notify you as soon as it is resolved.