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n8n errors / Auth

The access token is invalid or has expired

platform: n8n / category: Auth

Cause

The OAuth2 HTTP node cannot auto-refresh because the API never issued a refresh token during the initial authorization.

Fix

Edit the credential and add the offline-access parameter to the Auth URI (for Google: access_type=offline&prompt=consent), then re-authorise to get a refresh token. If the API has no refresh tokens, store the token externally and inject it via an expression before each request.

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