MeisterTask Task assigned to me. Microsoft To Do Create task in task list.

If MeisterTask assigned to me, then create a task in MS To Do

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If you use Microsoft 365's To Do this will create a task there in a 'MeisterTask' folder. It adds a link to the MeisterTask itself in the description. I can't find a way to sync completion unfortunately, but at least it's in the app.