New answers tagged feature-service
TO answer my own question after some back and forth with ESRI support we confirmed this to be a "bug" with the version of ArcGIS Desktop (10.2.2) that I was using.
A little more digging and I found the answer. Sync enabled feature services started at Server version 10.2.1. http://server.arcgis.com/en/server/10.3/publish-services/windows/prepare-data-for-offline-use.htm
Alright I figured out what the problem was. For some reason the ServiceFeatureTable that is returned from the OpenAsync method doesn't have the OutFields defined and we must explicitly add each attribute to the list in order for the data to sync to the server. This code snippet shows how this can be done: var gpsLocFeatureTable = await ...
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