Build using Feature branch works but not under Deployment stage

[Yogesh Mangela]

Hi,

I have an  Elastic Agent with all the capabilities for my project.

when feature branches commit & Push to bitbucket it triggers a build fine. OK
however,
when the feature branch is manually triggered Deployment doesn't work. 

i get an error

03-Jun-2021 09:27:45	Cloning into 'services'...
03-Jun-2021 09:27:45	Host key verification failed.
03-Jun-2021 09:27:45	fatal: Could not read from remote repository.
03-Jun-2021 09:27:45	
03-Jun-2021 09:27:45	Please make sure you have the correct access rights
03-Jun-2021 09:27:45	and the repository exists. 

is there settings anything i have missed.

BTY: i am using Packer locally to build the AMI which has all the capabilities.

now I added ssh-keygen to AMI too.
created a host and tried the same but doesn't work?