To fix this go to the Credentials section in n8n and test the connection. If it fails, re authenticate by clicking “Connect” and following the OAuth flow again. For API keys, make sure to double check the key in the service’s dashboard and make sure it’s not restricted to a specific IP or scope , also ensure the API has the right permissions like, for Google Calendar, it needs “read/write” access, not just “read.” If you are unsure, test the API call outside n8n using Postman to confirm the credentials work.
Lastly keeping a calendar reminder for token expirations helps avoid this in the future.
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