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list_workspaces returns zero. The install is fine. Your Penbox account is not a member of any workspace yet.Ask your workspace administrator to add you as a member, then try again. No reinstall needed.
A plugin installed during a session stays invisible to that session.Open a new session. In Claude Code you can also run /reload-plugins in the current one.
Codex asks you to approve the filesystem write at install, and again the first time a tool runs. codex exec cannot answer those prompts.Run the install and the first tool call in an interactive Codex session. After that, codex exec works.
Your client picks up a new version on its next launch, and only when the declared version moved.Restart the client. If the version is unchanged, there is nothing new to fetch.
Sign-in happens on the first Penbox tool call, not at install time.Ask the agent to list your workspaces. That first call triggers the OAuth flow.

Still stuck?

Write to support@penbox.io with the tool name and the exact refusal message.