Nexus 7 No Photon Devices Found

The Photon is breathing in cyan. The Photon is not listed in the Particle app on the Nexus 7 tablet.

Breathing blue or breathing cyan?
How did you configure the device, and have you claimed it to your account? Could you try logging out/in again, making sure you haven’t accidentally created two accounts (due to a typo or something)?

Blinking slowly in cyan. The Photon is not listed in the available WiFi networks. It use to show the name of Photon-******. I am logged in particle. It says Sucessfully completed login!

$particle serial identify: ‘! serial: Serial timed out’

Please be very accurate when describing the LED patterns, since they portray different states.

Is it just blinking cyan, or are there any other colors as well (red/orange)?

To see the network, or to be able to connect over Serial you need to be in Listening mode: blinking blue. Try holding the mode button for ~4 seconds to get there and give it another shot.

Same error message.

? Please enter your password *****************************
> Successfully completed login!

! PROTIP: Hold the MODE/SETUP button on your device until it blinks blue!
! PROTIP: Please make sure you are connected to the internet. 

> I have detected a Photon connected via USB.
? Would you like to continue with this one? Yes
! The Photon supports secure Wi-Fi setup. We'll try that first.

! PROTIP: Wireless setup of Photons works like a wizard!
! PROTIP: We will automagically change the Wi-Fi network to which your computer is connected.
! PROTIP: You will lose your connection to the internet periodically.

? Found "Photon-*****". Would you like to perform setup on this one 
now? Yes

! PROTIP: You will need to know the password for your Wi-Fi network (if any) to proceed.
! PROTIP: You can press ctrl + C to quit setup at any time.

> Obtained magical secure claim code.

! PROTIP: There was a network error while connecting to the cloud...
! PROTIP: We need an active internet connection to successfully complete setup.
! PROTIP: Are you currently connected to the internet? Please double-check and try again.

Could you try particle serial wifi?

WiFi reconnected using ‘particle serial wifi’ in Particle in terminal on the Apple iMac OS Sierra version 10.12.2.

Signed into Particle app on Nexus 7 tablet. After pressing the ‘+’ symbol on the Particle app no device is listed.

Photon-**** is listed in WiFi nearby networks on the Apple iMac computer.

iMac computer is connected via WiFi.
Photon not listed in AT&T U-verse in Home Network Device Lists.

MAC filtering disabled in AT&T U-Verse WiFi settings.

Could it be the Photon is registered to the first email account? How can I register the Photon with a new email address?

Photon-***** is listed in nearby WiFi networks in Nexus 7 tablet.

Photon flashing blue.

If the wifi config was successful try issuing particle device add [ID] to claim it to your account, while the device is online.

The following prompt.

? That device belongs to someone else. Would you like to request a
transfer? Yes
Failed to claim device, server said: Device has already pending transfers

Then it’s most likely claimed to that “previous account”. If you still have access to that account, you can ‘release’ it from there. Otherwise, using the app would be the only solution to ‘overrule’ that claim, short of asking Particle to release it.