Permission denied while running rose stem

[mcdalvi]

Hello,
I am trying to run my first rose stem suite under git and am getting the following error for 'extract_source'

RuntimeError: [FAIL] Issue found running command ['git', '-C', '$HOME/cylc-run/vn14.0_git_test/run1/share/source/casim', 'fetch', 'origin', '2025.12.1']

git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

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

[FAIL] python3 rose_stem_extract_source.py # return-code=1

I am able to execute ssh -T git@github.com , have SSO enabled and even extract the CASIM source using git clone -q git@github.com:MetOffice/casim.git

What additional authentication is needed for this, or is the use of tokens or mirror recommended for rose stem?

Thanks

[yaswant]

Can you try again after adding an entry in your ~.ssh/config

Suggest you generate a dedicate ssh key-pair for GitHub.

Host github github.com
  User git
  IdentityFile %d/.ssh/<ssh-key-paired-with-GitHub>
  IdentitiesOnly yes
  ForwardX11 no 

[mcdalvi]

Thanks Yash, that has allowed the suite to pass the extract step !

Yes, I do have a separate key for GitHub created for the training course.