3Nic template - AWS

I'm trying to use the Cloudformation script from the git repo to create a cluster pair across two AZs byol in an existing VPC to use CFE for failover. I've verified that the VPC is set up correct with internet access using a test EC2 linux server on the management network. When I execute the Cloudformation script, the LTM does not have internet access and licensing as well as script downloads fail. All the prerequisites have been met. Using version 15.1.2.1.

Has anyone else run into this issue?