You don't need to send it back, as there's no hardware failure (the OS2 is even connected to your Wi-Fi network, indicated by the LED state).
Have you tried using sharkrf.link to open the web interface?
Please make sure your browser device (phone/tablet/computer) is connected to the exact same Wi-Fi network as you've configured for the OS2.
Make sure Wi-Fi client isolation is turned off in your Wi-Fi router's settings.
- Place the openSPOT2 close to the Wi-Fi router.
- Make sure the Wi-Fi bandwith is set to max. 20Mhz in the Wi-Fi router (see explanation here:
https://superuser.com/questions/542191/does-moving-my-router-from-20mhz-to-40-mhz-increase-my-wireless-speed
)
- If it still does not work, try switching Wi-Fi channel on your Wi-Fi router. Only channels 1, 6 or 11 should be used (see explanation here:
https://www.metageek.com/training/resources/why-channels-1-6-11.html
)