I've also been getting the "Uplay service is unavaliable" problem.
It's definitely not a problem on my end, I went to two other people's houses and tested it out on their internet, same thing.
UK Forum Manager
Hi, the GRC unlock problem should have been resolved. If you are still having issues please email GRN Support, the email address is in my signature.
i am having the same problem. i cant get any of my camos to go on to GRN nor the gun.... i have sent emails for tech help and still nothing has changed or gotten an email saying anything