Hello,

what is the model number of the AC2800？

Cause other devices work properly except the sky q TV box, we can do some troubleshooting.

First, it is suggested to change some wireless settings of the ac2800, including wireless channel and channel width. 

Note: For 2.4GHz, you can use channel 1, 6 and 11; channel width as 20MHz; for 5GHz, try to use channel 36. 40 or 44, channel width as 40MHz.

After that, please check whether the sky Q TV box can detect the wireless network names. 

Besides, can it recognize other wireless networks? 

Meanwhile, you can contact the tech support of the sky q TV box to get some specific answer at their end cause they are more professional about their products. 

Good luck for you.