--- title: "LinkedIn Marketing API Publisher lists require a surface field: 2026-12-15 | Harbyn" description: "LinkedIn Marketing API Publisher lists require a surface field, effective Dec 15, 2026." canonical: "https://harbyn.com/changes/linkedin/2026-10-14-publisher-lists-require-a-surface-field" last-updated: 2026-10-14 --- # LinkedIn Marketing API Publisher lists require a surface field Markdown version of . Breaking change - LinkedIn Marketing API. high severity. Announced. Upcoming. Starting with version 202611, requests to create publisher lists without a valid surface (LAN or CTV) will fail with a 400 error. After December 15, 2026, campaigns and account trust preferences can only use publisher lists whose placement type matches the campaign; requests that do not meet this rule will fail with a 400 error on every API version. Lists already attached to campaigns will keep working. 51 days left: the deadline is Dec 15, 2026. ## Facts | Fact | Value | | --- | --- | | Vendor | [LinkedIn Marketing API](https://harbyn.com/vendors/linkedin.md) | | Kind | Breaking change | | Severity | high | | Status | Announced | | Announced | Oct 14, 2026 (undated by the vendor; the day it first appeared) | | Effective | Dec 15, 2026 | | Added to Harbyn | Oct 14, 2026 | | Lead time | 62 days of warning | | Endpoints | `POST /adPublisherRestrictions`, `ANY /adAccounts/{id}/adCampaigns`, `ANY /adAccountTrustPreferences` | | Review | Reviewed by a person, extracted by a model | ## Find it in your code ```sh npx harbyn scan ``` The scanner reads your repository on your machine and reports every file and line that uses the identifiers above. Nothing leaves your machine. ## Sources Where this event comes from: the page we read, when we read it, and the hash of that snapshot. - (changelog, fetched 2026-10-14 17:17 UTC, sha256 `8b21a127d6fba136a6492d349ae331abea51c2364385bf8b44097438a19a8e11`) ## Related changes ### More from LinkedIn Marketing API - [version 202510 is removed on 2026-10-15](https://harbyn.com/changes/linkedin/2026-10-08-marketing-api-version-202510-sunset.md) (Retirement, effective Oct 15, 2026) - [version 202511 is removed on 2026-11-16](https://harbyn.com/changes/linkedin/2026-10-08-marketing-api-version-202511-sunset.md) (Retirement, effective Nov 16, 2026) ### Changes at other vendors - [Amazon Selling Partner API: October listing attribute usage and enumeration value updates](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-2.md) (effective Oct 26, 2026) - [Supabase: four CBC-mode TLS 1.2 cipher suites will be removed from project HTTP APIs](https://harbyn.com/changes/supabase/2026-10-12-an-outdated-subset-of-tls-1-2-ciphers-will-be-disabled-on-project-http-apis.md) (effective Nov 10, 2026) - [Google Workspace APIs: OAuth clients must be marked as agentic to call Google Workspace MCP servers](https://harbyn.com/changes/google-workspace/2026-10-12-oauth-clients-must-be-marked-as-agentic-to-call-google-workspace-mcp-servers.md) (effective Nov 11, 2026) - [Bitbucket Cloud API: Git Credential Manager upgrade required for OAuth 2.0 Git authentication](https://harbyn.com/changes/bitbucket/2026-10-13-git-credential-manager-upgrade-required-for-oauth-2-0-git-authentication.md) (effective Nov 30, 2026) [All upcoming deadlines](https://harbyn.com/deadlines.md)