Please watch the video it explains everything
It looks like your topic is missing some important information. Could you provide the following if applicable.
- n8n version:
- Database (default: SQLite):
- n8n EXECUTIONS_PROCESS setting (default: own, main):
- Running n8n via (Docker, npm, n8n cloud, desktop app):
- Operating system:
Hi @Adam_Harvey ,
Welcome to the community! 
Thanks for recording a video - that’s super helpful.
Could you confirm that the workflow settings in the sub-wf are allow it to be called by the wf you’re wanting to trigger it and by your account (in case you have multiple users)?
you can find this on the top right menu.
Also, since this started happening out of nowhere - did you do any changes at all to your set up or wfs? Upgrade version, etc?
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