I can also confirm that it has not been working for over a week now. Whenever I first log in to the NFS Network, I simply get the message "Could not fetch new data from Autolog. Your last known data will be displayed. Some may be missing" So the NFS Network doesn't seem to be syncing to the game. Additionally, the Overwatch feature doesn't appear to work at all except for the map appearing. My rank and unlocks don't show up. My Overwatch Challenges aren't appearing either.
So basically the whole system seems a bit defunct at the moment. I have tried to sign out and relog while in game to no avail. Playing on Xbox One, not that it makes any difference.
I had completed quite a few of the challenges up to unlocking two of the bentleys, the maserati and several liveries. Not sure if this issue occurs once you complete a certain number of Overwatch Challenges or not.