This article describes what to do if the network is not found.
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INSTRUCTIONS & INFO
To troubleshoot mobile hotspot Wi-Fi not found make sure the device is awake. Wi-Fi standby by default will stop broacasting the Wi-Fi network after 15 minutes of inactivity. Tap the Power button to start broadcasting.
Make sure your device is not blocked, to check, from the homescreen, tap Wi-Fi.
Tap Blocked Device List and make sure your device is not listed.