@joostvanderhulst It’s a while I don’t go through it. If I remember correctly, you must link your Microsoft account with the Apple Reminders. It means activate your Microsoft account on your Mac and flag Reminders (see the attached picture). This should allow you to use Microsoft To Do instead of Apple Reminders. When you create a new reminder on Agenda just select the list you prefer: this could be a Reminders list or a Microsoft To Do list.
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