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The `tag-external-contributions.yml` workflow was using `GITHUB_TOKEN` to add the `external` label to PRs, which silently prevented the `labeled` event from propagating to `require_issue_link.yml`. GitHub Actions suppresses events created by `GITHUB_TOKEN` to avoid infinite loops — but in this case, the downstream workflow depends on that event to enforce the issue-link requirement on external PRs. ## Changes - Switch `github-token` from `secrets.GITHUB_TOKEN` to the existing App token (`steps.app-token.outputs.token`) in the "Add external label to pull request" step of `tag-external-contributions.yml`, so the `labeled` event fires and triggers `require_issue_link.yml`