I was able to figure this out, it appears the default phoenix app config for needed to be changed to allow ipv6 connections:
config :live_state_platform, LiveStatePlatform.Repo,
# ssl: true,
socket_options: [:inet6],
url: database_url,
pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10")
The socket_options line was commented out initially by the phoenix generator at least at the version I had.