Beginner : I don't understand how to checkout a private repo (Secrets)

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Hi community,
question from a newbie in Github Actions ... I feel desesperate, i've spent hours on it, reading the help again and again but that's not clear to me, why it fails.

In my github actions from repo_A I want to checkout repo_B. A et B are private in the same organization ORGX.

Here is the piece of code i've been upto (very simple)

- name: Checkout repo B
      uses: actions/checkout@v4
      with:
        repository: ORGX/repo_B
        ref: main
        path: dir_B 
        token: ${{ secrets.how_to_create_this}}
        lfs: true

I don't know how to create the secrets, i have admin access. It seems there's different type of secrets, at account level in "Secrets and Variables" :

I can create a secret but i don't know what the value should be .

Secrets can also be set within repo_A and repo_B settings :

I would really appreciate a step by step short tutorial.

Here is the error i have if it can help

/usr/bin/git -c protocol.version=2 fetch --no-tags --prune --no-recurse-submodules --depth=1 origin +refs/heads/main*:refs/remotes/origin/main* +refs/tags/main*:refs/tags/main*
  Error: fatal: could not read Username for 'https://github.com/': terminal prompts disabled
  The process '/usr/bin/git' failed with exit code 128
  Waiting 18 seconds before trying again
  /usr/bin/git -c protocol.version=2 fetch --no-tags --prune --no-recurse-submodules --depth=1 origin +refs/heads/main*:refs/remotes/origin/main* +refs/tags/main*:refs/tags/main*
  Error: fatal: could not read Username for 'https://github.com/': terminal prompts disabled
  The process '/usr/bin/git' failed with exit code 128
  Waiting 14 seconds before trying again
  /usr/bin/git -c protocol.version=2 fetch --no-tags --prune --no-recurse-submodules --depth=1 origin +refs/heads/main*:refs/remotes/origin/main* +refs/tags/main*:refs/tags/main*
  Error: fatal: could not read Username for 'https://github.com/': terminal prompts disabled
  Error: The process '/usr/bin/git' failed with exit code 128

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