I2S Hifiberry WM8804 no sound :(

[Oli477]

Hello guys,
i just flashed my esp32 with this great Software from MrBuddyCasino (Bluetooth to I2S), but I want to use it with my Hifiberry Digi (WM 8804 SPDIF IC). The I2S transmission seems to work as far as I can See with my oscilloscope, but I don't get SPDIF Signals. The WM8804 board work quite good with my Raspberry Pi, but not with the ESP. Do you know if i need to configure something else? Please help me... I want to use 44.1kHz and the wires BCLK, LRCLK and Data are connected correctely...