Calendar alerts aren't showing up
Calendar Op.2 doesn’t create its own alerts. Just like your events, alerts are produced and delivered by the built-in iOS Calendar — so the fix is always in the standard Calendar settings, not in Calendar Op.2.
Check these in order. The first is the most common cause and the easiest to miss.
1. Turn on “Event Alerts” for the calendar
- Open the built-in Calendar app → tap Calendars.
- Tap the ⓘ (info) button next to the calendar in question.
- Turn on Event Alerts.
Repeat for each calendar. If an event’s editor says “Alerts for this calendar are disabled,” this is the fix.
2. Allow notifications for Calendar
Go to Settings › Notifications › Calendar and turn on Allow Notifications (and Lock Screen / Banners / Sounds as you prefer).
3. Make sure the event has an alert
Open the event and check that an Alert is set (for example, “15 minutes before”). You can also set default alert times in the built-in Calendar’s settings.
4. Check Focus and Scheduled Summary
If alerts used to work and then stopped — often after an iOS update — a Focus / Do Not Disturb mode or Scheduled Summary (Settings › Notifications › Scheduled Summary) may be holding Calendar notifications back.