Question) Failed to find IP

Hello pg_auto_failover team,

I'm trying to set up it, but when I set the hostname, it doesn't work occurring error: failed to find IP.

I'm using docker container and I added dns info to the container, but it seems pg_autoctl ignores it, so I set hostname to my host's hostname, but it didn't work, then I set hostname to my host's IP, but it showed the same error: failed to find IP...

container side, it can resolve hostname, so I can curl hostname and IP both.
how to resolve it?

Thank you!