car won't start

Bottom line: my car doesn't recognize my key code. I started a zoom meeting on my phone on my way home tonight. When I got home, the meeting was still going, so I turned the ignition off and jumped out of the car with my phone in hand. The car started beeping and when I looked, the shift was in...

Just installed a new battery, and drove for a few days without problems. Today it won't start, just clicks when turning the key. Tried a battery jumpstarter I have (which is fully charged), and that's not starting it. Again, I just hear a single click when turning the key. Any ideas what might...