Cannot charge an iPhone 16 using two USB-C breakout boards

Components & Accessories Power
1

I have a project where I am using two USB-C horizontal breakouts with all 6 wires connected to both breakouts.

When I connect a USB-C cable between a power charger and my dev board and a 2nd USB-C cable to my iPhone SE (using a USB-C to Lightning adapter), I can charge my phone.

However when I try to connect my iPhone 16 without the Lightning adapter, it won’t charge. It will charge if I unplug the iPhone 16 from the dev board and plug in a MagSafe charger pad, the iPhone 16 will charge from that.

Has anyone come across this before?

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2

It sounds like the adapters have an internal IC or something that negotiates with the Apple device and needs it there to function normally