I had my steady blue flashing light and my app would find the PHOTON-XXXX ssid. However, they would never connect. Tried different many attempts, app reinstalls and using different Android mobile device - all failed.
It turns out the issue is my Netgear router’s wifi mode was not compatible with the device ONLY DURING SETUP. The router is set to 2.4GHz “b/g/n” mode (its a model WNDR4500).
I used my simple ATT wireless router and the setup went perfectly. During the setup I configured the device to my normal Netgear “2.4Ghz b/g/n” wifi manually and it connected perfectly and has continued to work just fine since.
For whatever reason, the initial device setup process could see my netgear wifi SSID but was never able to complete setup using its native setup process. By using a different (simple) wifi router/ssid for initial setup and then manually pointing it to my Netgear wifi/SSID all was fine.