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LinkedIn API Posting Errors Explained: 400, 401, 403, 422, 426 and 429

What LinkedIn Posts API errors actually mean and what to do about each: URN and field errors, expired tokens, missing company page roles, the 426 version sunset (202511 goes on 16 November 2026), daily 429 limits and media upload failures.

Darpan Patel · Nov 14, 2026 · 14 min