I attached the hub to USB & ThunderBolt 4 port. Due to my M1 iMac cannot charged with PD, USB controller closes this port I think. After connecting the hub to USB-C 3.2 port, USB-C port on the hub is started working. This is not an issue, it causes from misunderstanding how the iMac ports behave. Issue is resolved now.

Herkese merhaba, I’m using macOS Monterey 12.0.1 with Apple Silicon M1 iMac 24". I bought Hama USB-C Hub, Multiport, 5 Ports, 2 x USB-A, USB-C, HDMI™, LAN/Ethernet (GTIN: 4047443436818) from Turkey at last month. As I read on both technical specifications and user manual, the USB-C port on device is bi- directional; it both supports PD and data transfer. I tested this functionality both Windows 10 & 11 and macOS with M1 (Apple Silicon) chip. On Windows , the port works bi-directional perfectly. However, Apple Silicon device not support data transfer from port, supports only power delivery. If I connect a USB-C device from mac port directly, it runs perfectly. I found this solution: " realized that I attached the hub to USB & ThunderBolt 4 port. Due to my M1 iMac cannot charged with PD, USB controller closes this port I think. After connecting the hub to USB-C 3.2 port, USB-C port on the hub was started working. This is not an issue, it causes from misunderstanding how the iMac ports behave."