I got recently the Maple ESP32 board from AnalogLamb.
http://www.analoglamb.com/product/maple-esp32/

It use the ESP-WROOM32 module, has an micro SD slot and a plug for a Battery.

So far as I read it the SD is connected to the Pins 2/4/12-15 Like described in the SDMMC_Test.
https://hackaday.io/project/19362-maple-esp32-esp32-wifi-bt-board-with-micro-sd
https://cdn.hackaday.io/files/19362828383808/Schematic__Maple%20ESP32%20R1.pdf

If I run the SDMMC_Test I got this response:

E (601) sdmmc_cmd: sdmmc_card_init: send_scr returned 0x109
Card Mount Failed

Is this some bug in the SD/MMC implementation or is there something other wrong