Your output includes this:
Git repo firstname.lastname@example.org:comp-dev-ar/trellis-test.git cannot be accessed.
https://github.com/comp-dev-ar gives a 404, which suggests to me that
comp-dev-ar does not have a GitHub account. Could you confirm that this is a real account and repo on the GitHub servers (not just on your local machine)? If it is not, note that you’ll need to create a real account and repo on GitHub servers and list it in
You might also compare whether these commands work from your local machine:
ssh email@example.com 'cd /tmp && git clone firstname.lastname@example.org:roots/bedrock.git'
ssh email@example.com 'cd /tmp && git clone firstname.lastname@example.org:comp-dev-ar/trellis-test.git'