Need help with ESP32 and MAX7219

Hi,
I try to wire my LED Matrix(MAX7219) up to a ESP32 DEVKIT V1. To my knowledge, this code should turn all LEDs on:

SPI2.setup({mosi:D23, sck:D18});
    let g = require('MAX7219').connect(SPI2,D5,4);
    g.displayTest(true);

but nothing happens. At the start all LEDs flicker and than turn off or stay lit in random patterns.
I double checked the wiring . I'm trying to connect via VSPI Ports on the board.