Container Apps cannot communicate in internal environment

Question

Hey Support Team,

I have an internal Container Apps Env behind an Application Gateway, with two Container Apps having enabled ingresses. The env is configured with a custom VNet so the Container Apps should be accessible from within the VNet.

The flow is like this:
Client request -> Application Gateway -> Container A -> Container B

When Container A makes an API call to Container B, it gets net::ERR_NAME_NOT_RESOLVED.
That happens for all the communication methods listed here https://learn.microsoft.com/en-us/azure/container-apps/connect-apps?tabs=bash.

What could I possibly do?

Thank you,
Alex