root@foreman:/etc/puppetlabs/code/environments/test# /opt/puppetlabs/puppet/bin/r10k -c /etc/puppetlabs/r10k/r10k.yaml puppetfile install -v debug2
...
[2018-01-02 10:21:33 - DEBUG] /etc/puppetlabs/code/environments/test/modules/foreman is already at Git ref master
[2018-01-02 10:21:33 - INFO] Updating module /etc/puppetlabs/code/environments/test/modules/nnse_icinga
[2018-01-02 10:21:33 - DEBUG1] Creating new git cache for "git@github.com:org/puppet-nnse-icinga.git"
[2018-01-02 10:21:33 - DEBUG2] Starting process: ["git", "clone", "--mirror", "git@github.com:org/puppet-nnse-icinga.git", "/var/cache/r10k/git@github.com-org-puppet-nnse-icinga.git"]
[2018-01-02 10:21:35 - DEBUG2] Finished process:
Command: git clone --mirror git@github.com:org/puppet-nnse-icinga.git /var/cache/r10k/git@github.com-org-puppet-nnse-icinga.git
Stderr:
Cloning into bare repository '/var/cache/r10k/git@github.com-org-puppet-nnse-icinga.git'...
ERROR: Repository not found.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
Exit code: 128
[2018-01-02 10:21:35 - ERROR] Command exited with non-zero exit code:
Command: git clone --mirror git@github.com:org/puppet-nnse-icinga.git /var/cache/r10k/git@github.com-org-puppet-nnse-icinga.git
Stderr:
Cloning into bare repository '/var/cache/r10k/git@github.com-org-puppet-nnse-icinga.git'...
ERROR: Repository not found.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
Exit code: 128
[2018-01-02 10:21:35 - DEBUG1] No unmanaged contents in /etc/puppetlabs/code/environments/test/modules, nothing to purge