I can help! This error means the workflow expects a UUID (a specific format like 123e4567-e89b-12d3-a561-426614174000) for the credential ID, but it's receiving something else. What's likely causing it: The credential ID field is empty, or It contains plain text instead of a UUID Quick question: Are you manually entering a credential ID, or selecting one from a dropdown? Can you share what value you're putting in the nodes.toolserver.credentialId field?