> ## Documentation Index
> Fetch the complete documentation index at: https://docs.letmepost.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# linkedin.author.urn_format

> The author URN must match urn:li:person:{id}. We surface the format check before LinkedIn's opaque 422.

## What it checks

The platform-account row's stored URN must match `^urn:li:person:[A-Za-z0-9_-]+$`. If we couldn't mint a valid URN at connect time (or the row was edited), this rule fires before the upstream call.

## Why this is a separate check

LinkedIn's `/rest/posts` returns a generic 422 with no field path when the URN format is wrong. Catching it locally surfaces the actual issue.

## Remediation

Disconnect and reconnect the account. The connect flow re-runs `/userinfo` to mint a fresh URN. If the issue persists, it's a sign of an upstream LinkedIn bug — open a support thread with the request id.