I just got my MY back from a Service Appointment, and had told them that the USB-C ports were not working. I had tried to plug in two different kinds of iPads and my iPhone 11, and none of them would charge.
When I mentioned to the Service Advisors that the ports still weren't working (I checked before driving away) she went to go talk to a tech. She came back and said that these ports are not "compatible" with iPhone, but works properly for Android devices. The technician likely tried their personal phone and saw it working for them.
So, I don't know what the actual issue is, but I wanted my car back and decided to let it slide. I'd be happy to buy a different cable if I thought that would fix the issue, but the cable I have works perfectly well when I plug it into the front USB-C port.