Start Stop problem

My issue is with the auto start stop feature... I have a 2021 Honda Pilot Touring. When the car is running in drive the voltage drops down to 12.2v. When the idle stop engages the voltage drops even lower to <11.5 when the car tries to restart after releasing the brakes the voltage drops to <9v and if it drops too low the car aboorts the start and goes into neutral. Then I have to put the car into park and hope I can start it.. if not I need a boost... Im tired of bringing this vehicle to the dealer. They reprogrammed the computer twice they changed the starter. And now the Honda dealer says I need a new battery for the second time this year! The first time I got a Honda battery and no luck. The second time I went with an interstate battery and now they say the problem is that I got an aftermarket battery. Imo it doesn't matter what battery you get if the alternator is not charging the battery it's going not going to last.

This is what I used to check the voltage
https://a.co/d/fuZaGrC

I don't know what to do next...