ERR_OAUTH_EXPIRED on Airtable: OAuth token expired. Root cause: The OAuth 2.0 access token used to authenticate API requests has passed its expiry time and the refresh token either also expired or was revoked. OAuth access tokens typically expire after 1–2 hours; refresh tokens can be invalidated by password changes, security policy updates, or the user manually revoking the connected app's access. Step 1: Reconnect the Airtable account in your automation tool. In Zapier or Make.com, go to My Apps (Zapier) or Connections (Make.com), find the Airtable connection, and click Reconnect. This initiates a fresh OAuth flow and issues a new access token and refresh token. This is the fastest fix for an expired token. Step 2: Check if the Airtable user revoked access. In Airtable, go to Account → Integrations → Connected Apps. If the automation platform (Zapier, Make.com) is not listed, the user revoked access — either manually or because the account was deactivated. Reconnect the app to re-grant access. Step 3: Verify the Airtable account is still active. If the connected Airtable account belongs to a user who has left the organisation, their account may have been deactivated, which invalidates all OAuth tokens issued to that account. Reconnect using a shared service account or workspace owner account instead of a personal account. Step 4: Check Airtable's token expiry policy. Airtable OAuth access tokens expire after 60 minutes. Refresh tokens expire after 60 days of inactivity. If your automation runs less frequently than every 60 days, the refresh token will expire and you will need to reconnect manually. Consider scheduling a low-stakes test run weekly to keep the refresh token active. Step 5: Switch to Personal Access Tokens for long-running automations. For server-to-server automations that run infrequently, Airtable Personal Access Tokens (PATs) are more reliable than OAuth because they do not expire automatically. In Airtable, go to Account → Developer Hub → Personal Access Tokens → Create Token. Use this token in your automation instead of OAuth.