Chiming in on my experience with claiming both an Argon and a Xenon:
Nexus 6 – Android 7.1.1
Both Argon/Xenon does not work; stuck at the “Pairing with your Argon/Xenon” screen
Nexus 5 – Android 6.0.1
Argon: works, firmware updated to 0.8.0-rc.25, claimed and able to set up a mesh network. I see the device running Tinker in the CLI.
Xenon: barcode scanned, firmware updated to 0.8.0-rc.25
However, when attempting to join the mesh network previously created with the Argon, the screen stays at the “Your Xenon is scanning for mesh networks to join” with the mesh name correctly displayed, there is no further indication that I could do anything else.
Tapping the mesh network name brings me to the “Add Xenon to mesh network” screen, but it implies that I need to have a previously-added Xenon to act as the commissioner to allow a new Xenon to be added? But I’m only pairing my first Xenon with the Argon so that’s not possible… long story short, Xenon setup does not work.
Update: this wasn’t clear in the Particle App instruction as it implies to scan the barcode of another Xenon that’s already online. I tried putting the Argon gateway into listening mode and scanning it’s QRcode and now my Xenon is connected.