iPhone 15 usb-c to lightning adapter doesn't work with Belkin Rockstar lightning to lighting + headphone adapter.

Hi MrModus1878

welcome to the Apple (user-to-user) Community.

Re: "iPhone 15 usb-c to lightning adapter doesn't work

with Belkin Rockstar lightning to lighting + headphone adapter".

Am no expert in this area ... however your request surely deserves some response.

Fortunately, Apple support has articles with appropriate info. available online (links below):

iPhone 15: Charge and connect with the USB-C connector on your iPhone 15 - Apple Support

and

Examples of iPhone 15 Compatible adapters etc.: Power & Cables - iPhone Accessories - Apple

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Re: "Can someone tell me why this doesn't work?"

"I purchased an Apple usb-c to lightning adapter and plugged that into the Belkin adapter

thinking it should work for both charging and audio".

iOS17 : Power adapters for iPhone - Apple Support

more info: About Apple USB power adapters - Apple Support

About bluetooth headphones / audio devices with iOS 17

Set up and use Bluetooth accessories on iPhone - Apple Support:

or

Headphone jack adapter use / Use Apple wired headphones - Apple Support

Hope there's something helpful here, (or that others with more expertise join the discussion):

All the best :-)