I had been having an issue with the wireless charger charging my iPhone 12 mini. Two service calls later and I’ve learned that the positioning of the coil in the phone has a quirk due I’m assuming to the size of the phone. You have to barely insert it down into the charger, wait for it to start charging before sliding it down all the way. It will keep charging after it starts. If you go all the way straight down, it won’t charge. Weird.