Listening to Audible Audio in Car

Technical help please! I can't find anything that addresses this specific problem.

I want to listen to Audible audiobooks in my car. When I use a usb cable to plug my phone into the car and then hit "aux" on the car audio system, the car panel says "unsupported" and the audiobook plays from my phone, not through the car audio system.

Is there any way to fix this?

ETA: I got it! I needed a different cable.

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