Mina deploy configuration with ssh options

mina_deploy.rb

# config/deploy.rb

set :domain, 'remote.server.domain'
# Optional settings:
set :user, 'ubuntu'                                     # Username in the server to SSH to.
set :port, '22'                                         # SSH port number.
set :forward_agent, true                                # SSH forward_agent.
set :identity_file, '/path_to/remote/pem_file'          # Local path to SSH key.
set :ssh_options, '-o "ProxyCommand ssh jump -W %h:%p"' # SSH options ProxyCommand.

# This will invoke SSH sessions with:
# $ ssh ubuntu@remote.server.domain -i /path_to/remote/pem_file -p 22 -A -o "ProxyCommand ssh jump -W %h:%p"

A repository has been shared with me on GitHub. If I ssh git@github.com, it connects.
However, through mina, I get even when I try to deploy through ssh_options as -A, it says permission Denied