Generated public and private key using ssh-keygen -t rsa command on centos platform,

Added pub key at git settings and private key specified as credentials in Jenkins.

But in SCM step, facing below issue.

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Failed to connect to repository : Command "/usr/bin/git ls-remote -h – git@github.com:******/********.git HEAD" returned status code 128:
stdout:
stderr: /tmp/jenkins-gitclient-ssh1109458182151314425.sh-copy: line 6: ssh: command not found
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

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Jenkins version upgraded - Jenkins 2.375.3