Setting up a class set of W8 Lenovo tablets /w Office 365. Each tablet has it's own address and account, which is set up as [schools initals][asset number]

I've set IE to use our SWGFL connection and also ran the netsh winhttp set proxy command so Windows Updates and the store works.

Office 365 is installed, locally, using the Office 365 bootstrapper that came with the machine, and has been activated OK. WhenI launch work and click "Sign in to get the most out of office" (so docs can be synced to skydrive) every time it comes up with an error message "We are unable to connect right now. Please check your network and try again later".

I've got next to no Win 8 expereince and no 365 so I'm muddling along here...any tips?