RealVNC server installation on Red Hat 9 Enterprise EC2

heavym

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.

2. Set GNOME to start every time the system boots up:   
   systemctl set-default graphical.target
   The machine was rebooted.

3. 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.

4. VNC server license key was added 
   sudo vnclicense -add XXXXX-XXXXX-XXXXX-XXXXX-XXXXX   
   Successfully applied.

5. 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.custom

6. Register the common PAM configuration with VNC Server: 
   echo 'PamApplicationName=vncserver.custom' | sudo tee -a /etc/vnc/config.d/common.custom

7. Prepare 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-xorg

8. Configure and start VNC Server in Virtual Mode daemon   
   sudo systemctl start vncserver-virtuald.service

9. Tried 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.