AWS EC2 Linux 2 MATE -- GUI Issue -- "cannot open display,various error numbers 3389, 3470"

First-off, I am accessing VM from Android.

Free Tier AWS EC2 Linux 2 with MATE desktop pre-installed, starts/boots in CLI !?

Connection through SSH Client from Android has been established smoothly & works fine.
The root passed has been set up too.

The systemctl has been set to default on boot to desktop.
sudo systemctl set-default graphical.target

Despite all that the reboot defaults in cli, how do manage to initialize MATE desktop?