From what I know about Microsoft Planner, you don’t have any API trigger that you could set to directly to n8n. The best way would be to use the Microsoft Automation tool called Power Automate, link it to your planner and setup rules for your tasks. From there, you should be able to setup triggers and add HTTP actions to link PA to n8n. It shall require a bit of configurations I guess but this appear for me the only way.
we’ve actually built exactly what you’re describing, a community node for Microsoft Planner that lets you create, update, and manage Planner tasks directly in n8n.
You can install it right from your n8n instance under
Settings → Community Nodes → Install → @blickwerk/n8n-nodes-microsoft-planner