Hello, Fraser.
The hubs normally broadcast on both frequencies. I'm not sure why it wouldn't be broadcasting on 5Ghz unless it was disabled.
To double check, it might be worth trying a Network Analyser. There's a useful one for Android and iOS that will allow you to scan the bands in your area. Once you download that, you can head to the Wifi Signal Tab, then tab the Icon that shows two wireless signs facing each other to switch between the different bands. You should be able to see the 5Ghz networks, and determine if your hub is broadcasting one.
If it isn't, I'd recommend doing a factory reset of the hub in order to restore default settings, which include 2.4ghz and 5Ghz being active at the same time.
Pete.
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