I am trying to create an IPsec tunnel between two AWS VPC (VPC A and VPC B). Please refer the diagram below.
In VPC A, I've created the Virtual Private Gateway for a Site to Site VPN connection to VPC B. In VPC B I am using Mikrotik Cloud Hosted Router to establish the VPN connection. The IPSec tunnel gets established succesfully between the two VPC and the following ping (on private IPs) works successfully.

1. EC2 Instance A to Mikrotik Cloud Hosted Router (VPC B)
2. EC2 Instance A to EC2 Instance B
3. Mikrotik Cloud Hosted Router (VPC B) to EC2 Instance A.

However the ping from EC2 Instance B to EC2 Instance A doesn't work, it always gets timed out. For troubleshooting I enabled all traffic on all ports of the firewall of both the VPC it still didn't work. I've also tried to update the route table in VPC B to direct any traffic with destination as 10.2.0.0/16 to Mikrotik Cloud Hosted Router but it still didn't work.

Please let me know if I am missing something.