8/16/22 cut off is for cars not assembled in North America. You don't have to worry about that with Mach E. That rule is mostly for other EVs such as Rivian, Kia/Hyundai etc where its not assembled in North America.
Did you clear out PAAK data in the car? I had a similar issue yesterday trying to set up PAAK after getting a new phone and I had similar issue as you until I cleared out PAAK from the car's setting. I didn't try master reset so I don't know if that clears out PAAK or not.
for me, the lock button doesn't really work unless i key in my pass code on the door. Not sure if its because I'm using PAAK and not fob though.
On another note, I got my windows tinted (3M crystalline in windshield and 3M ceramic on front 2 doors) and it cuts out a lot of heat from sun. I...
I use youtube music on iphone and it does drain the battery a lot. Also, leaving the phone on wireless charging makes the phone get really hot as well.