Can’t find XBox X on my assigned devices to set up a schedule for my son

[CT125]

I had the XBox series x showing in my app as one of my devices and was managing it as part of a schedule for my son, otherwise he doesn't go to sleep. 
I removed it with the intention of setting up a schedule separate for it and his laptop but now I can't get it to show back up in app. 

it's working fine and clearly connected to the broadband but no sign of it as a device to add to my list. 
I had him forget the network and rejoin but it still isn't there and there is no wps that I can find to do it that way, plus it hasn't a camera to do the qr code. 

can anyone help me figure out where I'm going wrong please?