I was running into the same issue. I finally got it working. Instead of using [email protected][email protected]
, you have to use [email protected][email protected]
. This results are in "[email protected]": "/contacts(f76e4e7c-ea61-e511-80fd-3863bb342b00)"
"[email protected]": "/contacts(f76e4e7c-ea61-e511-80fd-3863bb342b00)"
To get the list of properties, look under the single-valued navigation properties at this location,in the https://msdn.microsoft.com/en-us/library/mt593034documentation.