RealVNC server installation on Red Hat 9 Enterprise EC2

Hello, dear community.
I’m struggling with RealVNC server enterprise installation on a new EC2 instance with Red Hat 9 AMI.
My main goal: Allow multiple domain users to connect to the machine using RealVNC viewer.
Actions that were taken:
1. GNOME GUI was installed following this article:
[https://linuxconfig.org/install-gnome-gui-on-rhel-7-linux-server].
(https://linuxconfig.org/install-gnome-gui-on-rhel-7-linux-server)
yum groupinstall "Server with GUI"
Installation was successful.
Set GNOME to start every time the system boots up:
systemctl set-default graphical.target
The machine was rebooted.Installing VNC server (6.11) using this article:
[https://help.realvnc.com/hc/en-us/articles/360002253818].
(https://help.realvnc.com/hc/en-us/articles/360002253818)
Installation was successful.VNC server license key was added
sudo vnclicense -add XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
Successfully applied.Enable domain users to connect to VNC Server using system credentials:
echo -e 'auth include password-auth\naccount include password-auth\nsession
include password-auth' | sudo tee /etc/pam.d/vncserver.customRegister the common PAM configuration with VNC Server:
echo 'PamApplicationName=vncserver.custom' | sudo tee -a /etc/vnc/config.d/common.customPrepare a system for VNC Server in Virtual Mode:
Install X11 dummy drive on Redhat-compatible systems:
sudo yum install xorg-x11-drv-dummy
Configure VNC Server to use X11 dummy driver
sudo vncinitconfig --enable-system-xorgConfigure and start VNC Server in Virtual Mode daemon
sudo systemctl start vncserver-virtuald.serviceTried to connect to the machine using RealVNC viewer to machineIP:5999
Getting time-out error message.
netstat -tunlp output shows that port 5999 is listening.
What am I missing?
I really appreciate any help you can provide.
Thanks!
Thank you.
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