Internet access using bridges on ubuntu server 20.04

I am working on a network simulator program to control different stats of outgoing network.

Issue:
Unable to get internet connectivity through LAN ports which are part of the bridge.
Setup:
Gigabyte server machine with 5 ethernet LAN ports (Individually all the ports are working properly)
Ubuntu Server 20.04, no UI.
Current setup of LAN Interfaces:
Port enp4s0: Primary port for internet connectivity (Not part of any bridge)
Bridge: br0 (Having 4 lan interfaces)

• Port enp2s0f0: Lan Cable connected to Router with Internet connectivity)
• Port enp2s0f1: Out Lan Cable for internet access to Machine X
• Port enp3s0f0: Out Lan Cable for internet access to Machine Y
• Port enp3s0f1: Out Lan Cable for internet access to Machine Z

I have tried creating the bridge using following Ubuntu utilities:
ip link
netplan
nmcli

With all these utilities the bridge gets created successfully. But on Machine X, Y and Z there is still no internet connectivity.

Yaml file for netplan

anshul@simulator:~$ cat /etc/netplan/00-installer-config.yaml
# This is the network config written by 'subiquity'
network:
  ethernets:
    enp2s0f0:
      dhcp4: false
    enp2s0f1:
      dhcp4: false
    enp3s0f0:
      dhcp4: false
    enp3s0f1:
      dhcp4: false
    enp4s0:
      dhcp4: true
  version: 2
  bridges:
    br0:
      dhcp4: true
      interfaces:
        - enp2s0f0
        - enp2s0f1
        - enp3s0f0
        - enp3s0f1

br0 bridge is getting the IP address also: (ssh to this ip is also working fine)

anshul@simulator:~$ sudo ifconfig
br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.120  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::87c:43ff:fed2:20fb  prefixlen 64  scopeid 0x20<link>
        ether 00:1b:21:89:70:78  txqueuelen 1000  (Ethernet)
        RX packets 3208  bytes 1444271 (1.4 MB)
        RX errors 0  dropped 85  overruns 0  frame 0
        TX packets 1220  bytes 137380 (137.3 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I have already spent quite a considerable amount of time on this, any pointers will be highly appreciated.