Authentication Failure/ Configuration Error on boot

I’m trying to build VyOS ISO on docker as mentioned here https://docs.vyos.io/en/latest/contributing/build-vyos.html

I’m running the following command
docker run --rm -it --privileged -v $(pwd):/vyos -w /vyos vyos/vyos-build:current bash

Post this I generate to build an AMI following these instructions : https://github.com/vyos/build-ami/blob/master/README.md

./configure
sudo make AWS

I do this in place of sudo make iso so the ami is EC2 compatible.

However, when I deploy the AMI to EC2 , I get this error while Vyos boots up:

vyos-config[1671]: Configuration Error
Welcome to vyos -ip-30-0-48-10 tty1
ip-30-0-48-10 login:user (automatic login)

Authentication failure.

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All of this works for the vyos 1.2 crux. But fails for sagitta. Any pointers on how to debug or fix this ?