Im having issues after installing ubuntu server 22.04 on raspberry pi 4

The interface wlan0 is down.

After following the official tutorial from ubuntu (https://ubuntu.com/tutorials/how-to-install-ubuntu-on-your-raspberry-pi#3-wifi-or-ethernet), im unable to set the interface up.
I've configured network-config file and rebooted but it doesn't connect.
Also I've tried with:

ip link set dev wlan0 up

But it refuses to set the interface up. There is nothing in syslog or dmesg.

Also, I've edited /etc/netplan/50-cloud-init.yaml with the example given and running netplan apply, but it shows me the following error:

/etc/netplan/50-cloud-init.yaml:12:1: Error in network definition: unknown key 'wifis'

Does anybody know how to fix this problem?

I'm a bit new with netplan

I've edited the post to include the output of following commands: ip a && cat /etc/netplan/*.yaml

# ip a



1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo

   valid_lft forever preferred_lft forever

inet6 ::1/128 scope host 

   valid_lft forever preferred_lft forever

2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000

link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff

3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000

link/ether yy:yy:yy:yy:yy:yy brd ff:ff:ff:ff:ff:ff

.

# cat /etc/netplan/*.yaml   



# This file is generated from information provided by the datasource. Changes

# to it will not persist acrossan instance reboot. To disable cloud-init's

# network configuration capabilities, write a file

# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:

# network: {config: disabled}

network:

ethernets:

    eth0:

        dhcp4: true

        optional: true

version: 2

wifis:

  wlan0:

    dhcp4: true

    optional: true

    access-point:

      "My SSID":

        password: "My Password"