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northern Gill
User level: Level 1 (4 points)

Calendar alerts not working since update to iOS 27.0.1

A few days ago I updated my iPhone 13 to ios 27. Now my calendar alerts are not working. I've googled and followed all checks suggested and still not working. Didn't realise until I missed an appointment.

Posted on Oct 17, 2026 9:34 AM

1 reply

WheelieNick
User level: Level 9 (74,110 points)

Oct 23, 2026 8:03 AM in response to northern Gill

Hi there

Please try this


Sometimes the local sync drops alert triggers after a major update: 

  1. Open Settings and tap your Apple ID name at the top. 
  2. Tap iCloud > Show All (under Apps Using iCloud). 
  3. Find and select Calendars, then toggle off Use on this iPhone.
  4. Choose Delete from my iPhone when prompted (your events remain safely stored in iCloud). 
  5. Force-restart your iPhone:
    • Press and quickly release Volume Up, press and quickly release Volume Down, then press and hold the Side/Power button until the Apple logo appears. 
  1. Go back to Settings > [Your Name] > iCloud > Calendars and toggle Use on this iPhone back on. 

2. Verify Notification & Time-Sensitive Settings

  1. Go to Settings > Notifications > Calendar.
  2. Make sure Allow Notifications is enabled.
  3. Ensure Time-Sensitive Notifications is toggled on (this allows alerts to break through certain system states).
  4. Under Alerts, check the boxes for Lock Screen, Notification Center, and Banners. 


Originally posted at discussions.apple.com/thread/256377916