12V dead and replaced, key not working

My 2015 Prius plug in sat for too long and the 12V died. Ran a trickle charger overnight and no dice. Bought a replacement 12V and installed and lights turn on, horn beeps and display tells me to depress brake hold key to power switch. Again, no dice. I replace the fob battery and the light on the fob turns on when I hit a button, but it does not unlock car or allow me to start the car normally or by touching the start button with the key itself.

I’m concerned, as it seems the implication is the car no longer recognizes this fob since it won’t even start with the powerless emergency method of touching the fob to the power button. I’ve seen threads on here reference an SKS deactivation switch or series of events to trigger SKS deactivation but can’t seem to locate a switch or get the magic steps to work. Any help is appreciated!

 

I mean, I think I am. I've tried close to 100 times pressing the brake pedal and holding the key to the button in a variety of different angles, I just don't think it's recognizing the key.

It's a brand new battery I bought from the auto store so I'd be pretty disappointed if that is the problem. Nonetheless if I can't find another solution I'll have to get a voltmeter to check. I'd assume that the alarm, lights, and dashboard all functioning is an indication that there is some voltage but for it to start it might be too low?

 

Local Toyota dealer is quoting me $140 to reprogram the key as they think I screwed something up when connecting the new battery. Gonna have to get it towed to the dealership.