Have your A6 and the phome connected to the same LAN. Scan the QR code on the A6 with your phone. Done. If something doesn't work, take note of the error message you get - it might tell WHY it thinks the A6 is not found. Usually these problems arise more easily in MESH-NETWORK environments, so if you happen to have one, try something that will grant both units on the same AP. Also, in your router you can try to have the A6 with STATIC IP address, rather than receiving one via DHCP. I cannot think anything other than this...