Troubleshoot a broken automation

Help me troubleshoot a broken automation.

What it should do: {{describe}}
Tool: {{zapier_make_n8n_other}}
What's happening instead: {{describe_2}}
Error message: {{paste_if_any}}
When it broke: {{after_a_change_randomly}}
What I've tried: {{list}}

Please:
1. Most likely cause
2. Step-by-step troubleshooting checklist
3. How to prevent recurrence
4. Known limitations of the tool if relevant

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