Common Pairing Issues
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Just because your computer can connect to a Wi-Fi network, it doesn't mean your device can.
Your device has a different Wi-Fi module inside of it that isn't necessarily as strong as your computer's Wi-Fi module.
If there's something blocking the signal, a large appliance is between the router and your device for instance, or your device is in another room, it may not be strong enough to connect.
If this is the case, your device will continue to drop offline once it has been paired, or it won't finish the pairing process successfully.
Move your device and computer closer to the router and try again or use another pairing option to connect to your device.