We have an Android TV at home. Turned it on tonight to watch some Netflix in the background, get informed that “the network needs to be set up”.
Okie dokie ... wait, the router isn't scanned? We'll enter it manually (already suspicious) ... now I have to guess whether it has WEP or WPA or WPA2. Enter password. Sorry, “router not found”.
After a few rounds of this, I googled this error, found a rant by some guy who'd paid for “geek squad support”, only to be informed, when he had them on the line, that he should go buy a new router. After swearing a bit, he said, he'd calmed down and just turned the damn thing off and on again.
So I turned it off and on again. It worked.