Where is the WPS button on the XB10?

According to the links below, the XB10s do support WPS. So, it's a dual-purpose button. Depending on how long it is held in, it can be either a WPS button or a factory reset button. Short pushes (2-3 seconds) result in the WPS function. Longer presses (15-20 seconds) result in a hard reset to factory defaults.

https://www.xfinity.com/support/articles/broadband-gateways-userguides? 

There appears to be two different manufacturers of the gateway;

https://www.google.com/search?q=CGM601TCOM+wps&sca_esv=c311fd178b8510f8&rlz=1C1CHBF_enUS937US937&sxsrf=AE3TifMcyH8euF0vG2B9-PQLhLSIdiI8xw%3A1753884672885&ei=ACiKaKrlNbLTp84P7O3YwQE&ved=0ahUKEwiq5Z3H4eSOAxWy6ckDHew2NhgQ4dUDCBA&uact=5&oq=CGM601TCOM+wps&gs_lp=Egxnd3Mtd2l6LXNlcnAiDkNHTTYwMVRDT00gd3BzMgcQIRigARgKMgcQIRigARgKMgcQIRigARgKMgcQIRigARgKMgcQIRigARgKSKOvAlC74wFYqIcCcAF4AZABAJgBwgGgAfkEqgEDMS40uAEDyAEA-AEBmAIGoAKWBcICChAAGLADGNYEGEfCAgQQIxgnwgIIEAAYgAQYogTCAgUQABjvBcICBRAhGKsCmAMAiAYBkAYIkgcFMi4zLjGgB8UWsgcFMS4zLjG4B44FwgcFMC40LjLIBxM&sclient=gws-wiz-serp 

https://www.google.com/search?q=SG417DBCT+wps&rlz=1C1CHBF_enUS937US937&oq=SG417DBCT+wps&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIHCAEQIRigATIHCAIQIRigATIHCAMQIRigATIHCAQQIRigATIHCAUQIRigAdIBCjE4ODk3ajBqMTWoAgiwAgHxBaTX03Bgosti&sourceid=chrome&ie=UTF-8 

@XfinityRichard 

FWIW, they were asked to six days ago; 

https://forums.xfinity.com/conversations/your-home-network/where-is-the-wps-button-on-the-xb10/6889a3981724e917a0485b18?commentId=688c47d4a58e6300d522e686&replyId=68948bd86aa068680c1dd576 

If you can't sort out the WPS button there is almost always a work-around.  Outside of home use WPS is regarded as a security problem.  Push a button to connect is a no-go in public spaces, offices, etc.  Can't have some visitor pushing a button and getting on the corporate network, etc.  There's almost always an alternative configuration method.

I've been using business grade WiFi access points with no WPS support at home for years and have yet to find a device that I couldn't get set up on my network.

For printers often you can plug them into a computer with a USB cable and run a program to set them up.  Sometimes the program comes with the drivers, other times it's a separate download.  Once it's set up you can unplug the USB.  The phone setup option (see below) works with a lot of them, and nicer ones with some sort of user interface allow you to set them up using buttons and a little screen on the printer itself.

Lots of devices have phone apps you can use to set the WiFi parameters.  Like I have this weather station that has a button you push to tell it to search for a phone running their app.  Their app disconnects your phone from WiFi and turns your phone into a WiFi hotspot with no internet access.  The weather station connects to the phone, then you punch in the WiFi settings on your phone.  Some of these apps will use Bluetooth instead if the device supports it.

Then there's a lot of stuff with some sort of user interface, like streaming gizmos, smart TVs, etc.  You just punch in the WiFi password.  Kind of annoying on a Nest thermostat... you get to dial in the password with a click wheel.