Purchased an AX1500 for use as my main router and an RE305 to extend my network to the back of the house and garage. Both show as supporting onemesh, and the RE305 shows up as onemesh capable in the Tether app.  

Any attempt to add the RE305 and configure as a mesh network on the AX1500, in the tether app, will result in an "operation failed" message.  Attempting to add the device via the web interface fails as well.  When logging into the RE305, and going to the onemesh page, it says that there is no compatible device.

I specifically went with these devices, due to them both supporting onemesh. Both also stated in the specs and on the packages as onemesh compatible. So why will the device not work ?