How to implement Fixed Signature request with "Focused View"

We are trying to use the “Request a signature using focused view” within our .Net Application (C#) and are having trouble using the Fixed Signature placement in the top right of the document. Note: The PDF’s we are having signed cannot be setup with the anchor because they will be invoices coming from multiple customers. 

We have it working using the anchor but when we switch to the fixed XPosition and YPosition, the document gets submitted and we can display it but the signature is not placed on the document. Here is the SignHere tab (comment is the working anchor). I tried width and height to see if it happened to be hidden 1 x 1 pixel, but no luck. 

Are we missing something in order to get the fixed signature placement on the document?