where did you create the Policy or Profile? web client vs C# client.
If you're in vCenter 5.5, then you have to do it from the web client. you also need to tag the datastores BEFORE adding them to the Storage Cluster (there is an issue about tagging afterwards).
Once they are added, you have to still add the Storage Policy to the Provider vDC before they will even show. Everyone seems to forget this, the Provider needs to know to use them before you see datastores or the profile listed in the other parts of the GUI.