I need 5G split for my Sleep IQ bed to function

@salpol   Most of the AT&T gateways (you don't say which model you have) are 2.4GHz and 5GHz combined into one Wifi Network Name (SSID).  The wifi devices are supposed to interact with the gateway and come to a decision as to which frequency they should connect to.

At least that's the theory, but things like your bed don't often do well when faced with this combined frequency situation so you've got two choices...

You have to separate the bands OR enable the Guest Wifi Network which is 2.4GHz only and point the camera to that.

To go with the first solution, go to http://192.168.1.254/cgi-bin/wconfig.ha and enter the Access Code which is found on the gateway itself.  In the 5GHz section change the Network Name (SSID) to something else.  I usually suggest just adding a -5 onto the end of the current name.  Scroll down and hit Save.  Oh, ignore the dire warnings about the end of civilization if you change the name.

After this, any devices that work better on 5GHz will need to be told to connect to the new SSID you just made but the exiting 2.4 devices should just keep working. 

If you'd rather go the Guest Wifi route, go to http://192.168.1.254/cgi-bin/wconfig_unified.ha and Enable the Guest SSID and point the bed to that Guest Network Name.  Again, don't forget to click Save.

That’s not “splitting,” it’s just two different WiFi bands. I’ve never heard of a router that supports 5 GHz but not 2.4 GHz, but if you really do have one, you would need a different router.

Thank you

My router has 2 SSID names, one for 5Ghz and one for 2.4 GHz has the same password for each. Look up your router documentation on how to connect to each. I have an old iPad that only connected to 2.4 GHz. 

Thank you for taking the time to explain all this to me!  I appreciate you!

It's unnecessary to disable band steering as a default.  You could just temporarily disable the 5GHz radio in the management console until the setup is completed.  Should work fine afterwards with the gateway in its standard operating mode.  

I've found that even though you can force IoT devices to just see the 2.4GHz band and connect that way, often times after you re-enable band steering  and the device loses the wifi connection for some reason you'll be back doing the same dance all over again.  So leaving the bands separated or just using the Guest Wifi eliminates that hassle.