I've had this AX1500 router for a little under a year now.  Hardware revision is 1.0.  I also have 3 xbox consoles on my home network, an XBOX One and two XBOX 360.  The XBOX 360 units lost the ability to connect to XBOX Live approximately 2 weeks ago.  Connection test shows they are connected to the network and internet, but not XBOX Live.  The XBOX One still works.

I believe this may have corresponded to the firmware update from AX1500(US)_V1_201230 to AX1500(US)_V1_220117.  

I've tried everything on the XBOX forums and believe it is the router, not the consoles.  The consoles work fine when either is connected directly to the cable modem bypassing the router.  Modem is a Motorola DOCSIS3.0 unit that has no built in routing.  

All 3 consoles are on wired connection.  One of the 360 units has wireless, but trying that yields the same results.

I've tried enabling/disabling UPNP.  Factory reset router.  Nothing seems to help.

At my wit's end here.  Anyone have this model or have a similar issue?  

I plugged an ancient other brand n150 router up and the xbox's all connect fine.  Everything else in my house is massively slower though.