configured ubuntu server wifi via installation disk, unable to use Network Manager

Question

I recently installed a Ubuntu Server from live ISO. During installation I configured a Wi-Fi network. However now, post-installation I am unable to use network manager (nmcli/nmtui) at all as it does not list Wi-Fi connections and my Wi-Fi interface shows as unavailable. My Wi-Fi works just fine and I am also able to scan for Wi-Fi networks just fine with:

sudo iwlist wlp108s0 scanning

Any ideas?

Attaching relevant snippet from the following network debugging script:

##### network managers ##################
Installed:
NetworkManager


Running:
root        1129       1  0 22:09 ?        00:00:00 /usr/sbin/NetworkManager --no-daemon
NetworkManager info
GENERAL.DEVICE:                         wlp108s0
GENERAL.TYPE:                           wifi
GENERAL.NM-TYPE:                        NMDeviceWifi
GENERAL.DBUS-PATH:                      /org/freedesktop/NetworkManager/Devices/2
GENERAL.VENDOR:                         Intel Corporation
GENERAL.PRODUCT:                        Wireless 8265 / 8275
GENERAL.DRIVER:                         iwlwifi
GENERAL.DRIVER-VERSION:                 5.15.0-92-generic
GENERAL.FIRMWARE-VERSION:               36.ca7b901d.0 8265-36.ucode
GENERAL.HWADDR:                         <MAC 'wlp108s0' [IF1]>
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.REASON:                         41 (The device's existing connection was assumed)
GENERAL.IP4-CONNECTIVITY:               1 (none)
GENERAL.IP6-CONNECTIVITY:               1 (none)
GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:1c.4/0000:6c:00.0/net/wlp108s0
GENERAL.PATH:                           pci-0000:6c:00.0
GENERAL.IP-IFACE:                       --
GENERAL.IS-SOFTWARE:                    no
GENERAL.NM-MANAGED:                     yes
GENERAL.AUTOCONNECT:                    yes
GENERAL.FIRMWARE-MISSING:               no
GENERAL.NM-PLUGIN-MISSING:              no
GENERAL.PHYS-PORT-ID:                   --
GENERAL.CONNECTION:                     --
GENERAL.CON-UUID:                       --
GENERAL.CON-PATH:                       --
GENERAL.METERED:                        unknown
CAPABILITIES.CARRIER-DETECT:            no
CAPABILITIES.SPEED:                     unknown
CAPABILITIES.IS-SOFTWARE:               no
CAPABILITIES.SRIOV:                     no
INTERFACE-FLAGS.UP:                     yes
INTERFACE-FLAGS.LOWER-UP:               yes
INTERFACE-FLAGS.CARRIER:                yes
INTERFACE-FLAGS.PROMISC:                no
WIFI-PROPERTIES.WEP:                    yes
WIFI-PROPERTIES.WPA:                    yes
WIFI-PROPERTIES.WPA2:                   yes
WIFI-PROPERTIES.TKIP:                   yes
WIFI-PROPERTIES.CCMP:                   yes
WIFI-PROPERTIES.AP:                     yes
WIFI-PROPERTIES.ADHOC:                  yes
WIFI-PROPERTIES.2GHZ:                   yes
WIFI-PROPERTIES.5GHZ:                   yes
WIFI-PROPERTIES.MESH:                   no
WIFI-PROPERTIES.IBSS-RSN:               yes
IP4.ADDRESS[1]:                         192.168.1.14/24
IP4.GATEWAY:                            192.168.1.1
IP4.ROUTE[1]:                           dst = 192.168.1.0/24, nh = 0.0.0.0, mt = 600
IP4.ROUTE[2]:                           dst = 192.168.1.1/32, nh = 0.0.0.0, mt = 600
IP4.ROUTE[3]:                           dst = 0.0.0.0/0, nh = 192.168.1.1, mt = 600
IP6.ADDRESS[1]:                         fe80::<IP6 'wlp108s0' [IF1]>/64
IP6.GATEWAY:                            --
IP6.ROUTE[1]:                           dst = fe80::/64, nh = ::, mt = 256
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: --
SSID  BSSID  MODE  CHAN  FREQ  RATE  SIGNAL  BARS  SECURITY  ACTIVE  IN-USE
NetworkManager.state
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
NetworkManager config
[[/etc/NetworkManager/conf.d/default-wifi-powersave-on.conf]]
[connection]
wifi.powersave = 3
[[/etc/NetworkManager/NetworkManager.conf]]
[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=false
[device]
wifi.scan-rand-mac-address=no
[[/usr/lib/NetworkManager/conf.d/10-dns-resolved.conf]]
[main]
dns=systemd-resolved
[[/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf]]
[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma
[[/usr/lib/NetworkManager/conf.d/no-mac-addr-change.conf]]
[device-31-mac-addr-change]
match-device=driver:eagle_sdio,driver:wl
wifi.scan-rand-mac-address=no
NetworkManager profiles (empty)