Finally I found the answer!
Here is the complete procedure:
1. Forced the architecture
sudo dpkg --add-architecture armhf && sudo apt update
2. Download RealVNC Server for Raspberry
([https://www.realvnc.com/download/file/vnc.files/VNC-Server-6.7.2-Linux-ARM.deb](http://RealVNC Connect Server for Raspberry)) and Install with GDebi
3. Copy the following lib files from the Pi4 firmware repository in folder /usr/lib
libbcm_host.so
libvcos.so
libmmal.so
libmmal_core.so
libmmal_components.so
libmmal_util.so
libmmal_vc_client.so
libvchiq_arm.so
libvcsm.so
libcontainers.so
4. Start VNC service
sudo systemctl start vncserver-x11-serviced.service
5. Enable Server Start on reboot
sudo systemctl enable vncserver-x11-serviced.service
6. Enter credentials
sudo vnclicensewiz
Many thanks to Angelo who published this Post in raspberrypi.org
Hope it helps