Popping up in the To-Do application today, we have:
All very interesting, since I didn't know the To-Do UWP application had a facility for 'system generated' to-dos! Needless to say. if you head to the Windows 10 Mobile Store then there's no update waiting and it's clear that development in the UWP app stopped a long time ago (early 2020). But it's nice of Microsoft to (un)helpfully suggest this, both in the app itself and on the help pages.
Microsoft To-Do was always a top notch service, very configurable and a worthy effort from the company in this busy space. I never had it as my main reminders store, preferring a homebrew system based on Google Keep and Google Calendar - I know, I know. Maybe I'm just not that much of a 'to do list' person? Most things I HAVE to do are time-specific and therefore they end up in my Calendar. But I always enjoyed playing with To-Do, at least.
Coming almost two years after the end of support for Windows 10 Mobile, one can't blame Microsoft from moving on and withdrawing support - see my Services feature that contains the status of other Windows 10 Mobile services and applications. I'm guessing that the OS itself is now something of a play thing or guilty pleasure for most folks reading this. But if not, then this is just another nudge onto a current supported smartphone platform.