Opel CD 500 recognizes IPod plugged in but fails play from device

[programmingbgloDE]

I have a car with a CD 500 Radio from Opel / Bosch. When I start the ipod-executable the radio sees the Ipod and tries to connect to it. On the display you can read "checking Ipod" after some seconds it stops doing that and I cannot select the Ipod as a media device.

Device Info:

• Model: Raspberry Pi Zero W
• OS: Raspbian 11 (bullseye)
• Kernel: 6.1.21+

Options for ipod-gadget:

sudo modprobe libcomposite
sudo insmod g_ipod_audio.ko
sudo insmod g_ipod_hid.ko
sudo insmod g_ipod_gadget.ko swap_configs=0 product_id=0x1293

after starting the executable with sudo ./ipod -d serve -w ipod_error.trace /Dev/iap0, I get the following trace
ipod_error.trace.txt

I tried looking into it but the I don't know where to start. Can someone help me?