What are common issues causing 'npm publish error 400' when dealing with dependencies?

Common dependency-related issues include: 1) Circular dependencies (package A depends on B, and B depends on A). 2) Incorrectly specified versions (e.g., using ranges like `^` that conflict with other dependencies). 3) Missing or incorrectly formatted dependency declarations. 4) Using dependencies that are not available on npm or are private dependencies not properly configured.