[Solved] AP15 throws error when attempting to create a 5GHz wireless network

I'm trying to setup a 2nd wireless network and am running into a problem that has me wondering what this AP can do.

When I try to create a 5GHz Wireless Network I get the following error:

"The AP '[name-of-my-AP]' can't participate in the wireless network 'Private Wireless', because it does not support operation on the 5 GHz band."

Why will the AP15 not support operation on the 5GHz band?

This is contrary to the advertised specifications of the device.

Thanks

Details:

This is a Sophos AP15 configured through a Sophos UTM Firmware Version 9.407-3.

The AP15 was purchased this week.