Static wifi configuration using /etc/network/interfaces.d and wpa_supplicant

__What I'm trying to achieve__ - Having two different local on the same network ips for Wifi and Ethernet, respectively on a GUI-less Debian Buster 10.10. Ethernet is working, but wpa_supplicant keeps crashing. I'm trying to follow the instructions on [Debian wiki](https://wiki.debian.org/WiFi/HowToUse#wpa_supplicant) .

2: enp2s0:  mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 00:1d:72:c7:ad:43 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.30/24 brd 192.168.1.255 scope global enp2s0
       valid_lft forever preferred_lft forever
    inet6 fe80::21d:72ff:fec7:ad43/64 scope link 
       valid_lft forever preferred_lft forever
3: wlp4s0:  mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 00:1f:3b:4e:88:eb brd ff:ff:ff:ff:ff:ff

Content of /etc/network/interfaces.d/enp2s0:

#custom configuration
allow-hotplug enp2s0
iface enp2s0 inet static
	address 192.168.1.30/24
	netmask 255.255.255.0
	gateway 192.168.1.1

Content of etc/network/interfaces.d/wlps40

allow-hotplug wlp4s0
iface wlp4s0 inet static
        wpa-ssid SSID_NAME_WITHOUT_QUOTES
        wpa-psk PSK_HASH_OBTAINED_FROM_WPA_SUPPLICANT_WITHOUT_QUOTES

        address 192.168.1.31
        netmask 255.255.255.0
        gateway 192.168.1.1

Content of /etc/wpa_supplicant/wpa_supplicant.conf

ctrl_interface=/run/wpa_supplicant
update_config=1

network={
	ssid=SSID_NAME_INSIDE_DOUBLE_QUOTES
	#psk="PSK_IN_PLAIN_TEXT"
	psk=PSK_HASH
}

Then created the [tag:wpa-supplicant] service and restarted it as instructed by the wiki page. Then the command :

$ sudo wpa_supplicant -B -Dwext -i wlp4s0 -c /etc/wpa_supplicant/wpa_supplicant.conf

I get this response :

Successfully initialized wpa_supplicant
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument

Journalctl is yelling: wrong key, but my gut is telling me that there are errors config-file wise on top of that. Any help will be much appreciated. # update # Moved and renamed /etc/network/interfaces.d/enp2s0 Edited /etc/network/interfaces.d/wlp4s0 as follows

#wlp4s0 custom configuration
allow-hotplug wlp4s0
iface wlp4s0 inet static
        address 192.168.1.31
        netmask 255.255.255.0
        gateway 192.168.1.1
        pre-up wpa_supplicant -i wlp4s0 -c /etc/wpa_supplicant/wpa_supplicant.conf -B -f /var/log/wpa_supplicant.log

Replaced the hash of the [tag:psk] with plain text. Deleted /run/wpa_supplicant/wlp4s0 and restarted the [tag:wpa-supplicant] service. Now I am able to connect to the internet using the wireless device. I ran sudo ifdown wlp4sO to bring the device down and see if I can bring it up, again. if up wlp4s0 succeeds after deleting /run/wpa_supplicant/