# Why didn't I receive any notifications?

If Oh Dear detected an issue but didn't tell you about it, one of these is almost always the cause:

1. **No notification channel is configured.** Check that you have at least one channel (email, Slack, Teams, SMS, ...) set up at the monitor or team level.
2. **The channel credentials are stale.** Expired Slack tokens, rotated webhook URLs, or changed Telegram groups will silently fail. Send a [test notification](/docs/notifications/send-a-test-notification-from-oh-dear) to confirm the channel is still healthy.
3. **The relevant event isn't enabled on the channel.** Each channel has a list of events it cares about. If "Site down" isn't checked for that channel, it won't fire.
4. **A maintenance window is active.** During a maintenance window, failed checks don't trigger notifications. Double-check the monitor's maintenance schedule.
5. **The check is snoozed.** If you snoozed a check to silence it during an ongoing incident, notifications will resume when the snooze ends. See [how snoozing works](/docs/notifications/how-to-snooze-notifications).
6. **The channel was automatically disabled.** If a channel keeps failing to deliver (for example, an invalid webhook URL), we disable it after a day of errors. See [why have my notifications been switched off](/docs/faq/why-have-my-notifications-been-switched-off).

Still nothing after checking all of those? [Contact support](/contact) with the monitor URL and the time you expected a notification. We can look up the exact decision our system made.