None of my calendar reminders in Outlook 2019 show in the reminders window. I had around 90 reminders in the window, the next time I started Outlook I had around 30 and now it's zero. Outlook was also flaky on autocomplete with new emails when reminders were deleted but that has resolved.

When I look at my calendar entries as a list and add the reminders column, I see the entries that have reminders, but they just don't show up in the reminders window.

File > Options > Show Reminders is checked. A new calendar entry with a reminder displays correctly.

Any ideas how to restore these besides doing so manually? I backup my PC daily - is it possible to restore whatever file tracks if a reminder had been dismissed?