car key symbol blinking

https://weekly-wiki.win/index.php/Understanding_the_Immobilizer_Fault_Nissan_Warning_and_How_to_Fix_It

That blinking car key symbol on your dashboard usually means the ignition system isn't detecting the correct key or fob, so the car won't start or run. It could be a dead battery in the key, a faulty key, or a temporary signal hiccup. It always makes me reach for my spare key first, just to rule out the simplest fix.