Verified operation on XIAO ESP32-C6 with following pinout. Using Mike Teachmans I2S examples as test cases. I2S Board was generic PCM5102 audio generator with 3.5mm output.

PCM5102 Signal Name Xiao C6 Signal Example Code Pin Vin 3V3 Gnd Gnd SCK Gnd BCK GPIO22 SCK_PIN = 22 LCK/RCK GPIO23 WS_PIN = 23 DIN GPIO16 SD_PIN = 16