Can you try doing the “manual” setup? (You won’t need to connect your computer to Wi-Fi.)
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Put your photon into listening mode.
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Run the command:
particle serial identify
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Copy the Device ID.
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Run the command:
particle serial wifi
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Follow the steps to select your Wi-Fi network.
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Let the photon reboot and connect to the cloud (breathing cyan).
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Run the command:
particle device add PASTED-DEVICE-ID
This should get the photon connected to Wi-Fi and claimed to your account.
You can rename the photon with: particle device rename PASTED-DEVICE-ID NEW-NAME