No passthrough working with LibreElec 9.2 RPI 4 Hifiberry

The passthrough of 6 channel sound is not working. It play always 2 channel only. It is a brand new RPI 4 with a hifiberry to get digital sound via S/PDIF. All settings are done to enable pass through but the sound device is getting 2 channels sound only. The log file and dmesg output are attached. The rest of the device is working very well. You have done a very good job. Thank you for your help.