Fixing Missing or Duplicate Appointment Notifications

Notification problems tend to fall into two very different buckets — messages not going out at all, and messages going out more than once — and each has its own set of likely causes.

Missing notifications

1. Check the notification settings on the specific calendar involved — confirmations, reminders, and cancellation messages are typically configured per calendar, and one can be toggled off without affecting the others.
2. Confirm the correct sending channel (email, SMS, etc.) is actually connected and in good standing — an expired sending integration will silently fail to deliver rather than throwing an obvious error to you.
3. Check the customer's contact record for the correct email or phone number — a typo or an outdated contact detail means the message is technically sending, just to the wrong destination.
4. Check spam or promotions folders on the receiving end before assuming the message never sent at all.

Duplicate notifications

1. Look for overlapping automations — a workflow set up alongside the calendar's built-in notifications can send a second message for the same event without anyone intending it.
2. Check whether the appointment was edited or rescheduled — some notification setups send a fresh confirmation on any update, which can look like an unwanted duplicate if that's not what you intended.
3. If duplicates are happening across an entire calendar rather than one appointment, check for a duplicate notification template or trigger accidentally created during setup.

General approach

Change one thing at a time and test with a real booking before making a second change — notification issues that involve both a calendar setting and a separate automation are hard to diagnose if you adjust both at once.

Good to know: Reminder and confirmation messages are usually configured separately from each other, even though they feel like one system — check both individually rather than assuming a fix to one covers the other.