LinkedIn

Fix LinkedIn 426 NONEXISTENT_VERSION by using the latest toolkit version

LinkedIn 426 NONEXISTENT_VERSION errors usually mean the request is using an older LinkedIn API version header. In Composio, this often happens when calls run on the base toolkit version 00000000_00 or another older pinned version. Specify the latest LinkedIn toolkit version on tool calls, or pin to the current fixed version if needed. If the error persists after switching to the latest version, contact Composio support with a failed call logId or request ID so the actual LinkedIn-Version header can be verified.

Fetch modern LinkedIn tools with toolkit_slug=linkedin and toolkit_versions=latest

The v3 tools-list endpoint defaults to the base toolkit version when no toolkit version is specified, which can return only legacy LinkedIn slugs. Use the singular filter toolkit_slug=linkedin; plural or alternate filters such as toolkit_slugs, toolkits, app, or app_names may be ignored. Add toolkit_versions=latest. Example: GET /api/v3/tools?toolkit_slug=linkedin&toolkit_versions=latest&limit=100.

LinkedIn organization scopes depend on the toolkit and auth config

An active LinkedIn connection can run personal/profile actions while organization actions return 403. Check the actual toolkit and scopes stored on the auth config: the standard LinkedIn flow commonly uses personal scopes, while LinkedIn Ads can request organization and advertising scopes.

For organization ACLs, page statistics, or company-page posting, use an auth config that explicitly requests the required organization scopes and reconnect so LinkedIn issues a new grant. Reconnecting an unchanged config does not add scopes. Do not assume provider approval alone means those scopes were requested by the concrete connection.

LinkedIn post creation supports image arrays through SDK/API

LINKEDIN_CREATE_LINKED_IN_POST supports image + text posting, including multiple images when using SDKs or APIs directly. Pass an array of values to the images field. If image posting fails, first confirm you are using a recent toolkit version, then contact Composio support with log IDs from failed tool calls if needed.

Use Connect MCP instead of legacy Platform MCP for consumer LinkedIn connector flows

For consumer/client connector flows, use connect.composio.dev / Connect MCP rather than the legacy Platform MCP endpoint. The API key does not belong in the URL; configure the x-consumer-api-key header shown by the current AI Clients setup. If LinkedIn MCP calls fail with 401 despite an active connection, confirm the endpoint and header type. If the error persists, contact Composio support with the exact error and log ID.

Fix LinkedIn Ads redirect_uri mismatch before debugging scopes

If LinkedIn rejects authorization with The redirect_uri does not match the registered value, register the exact callback shown by the current Composio auth-config flow in the customer's LinkedIn developer app. Do not guess between legacy v1, v3, and v3.1 callback paths; copy the callback from the current setup UI or auth-config documentation and match it exactly, without adding a trailing slash.

This error occurs before a successful callback and is separate from LinkedIn product or scope approval.

LinkedIn Ads unauthorized_scope_error means a requested scope is unavailable

LinkedIn rejects the complete OAuth request when any requested scope is unavailable to the developer app. Compare the exact auth-config scope set with the products and scopes enabled on that same LinkedIn app.

The default LinkedIn Ads flow includes OpenID Connect scopes (openid, profile, email) as well as advertising and organization scopes. Legacy r_basicprofile is not a substitute for the OpenID Connect scopes. Enable the relevant LinkedIn products or narrow a custom auth config to scopes the app actually has, then reconnect.