Cant connect my pi 4 automatically by using only the bootfile on the sd card

Question

Im trying to connect my pi 4 to the wifi via editing the boot file on the sd card. the wifi is a hidden network The following i tried to do, see picture.

the file name is [wpa_supplicant.conf] i added this file on the sd

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=NL
network={
  ssid="Hyperloop 2.4g"
  scan_ssid=1
  key_mgmt=WPA2-PSK
  psk="xxxmywifipaswordxxx"
}

Im wondering what i do wrong because i cant find the device on the network. I use an app to find devices that are connected to the network.

Thanks in advance