Same here - the uCOnnect app allows for vehicle control, but no vehicle data as of yet. Our account at mopar.com is also not providing any vehicle data, though it shows XM Guardian as active, and has the proper make/model/VIN.
To frame this a bit:
We have a DD/RT (being sold next week), also with uConnect, same app, same service, both the convenience features (lock/unlock, start/stop), and the vehicle status/info. It's always worked for the DD (in fact, we let the convenience service lapse, but the vehicle continued to work).
I'm also a software developer/architect, so I'm decently competence in understanding all the nuts~n~bolts.
I've done all manner of reset, delete, re-install, validated on other devices, etc., I think given the website itself has no data, the issue is at the vehicle end. i.e., it's not sending data upstream. Since ours is still very new, and we've put less than 20-25 miles on it, I'm going to wait till I have a good weeks worth of drive time/cycles, come back to this next Friday or so.