Settings

Send a test notification. Tap the notification to confirm it is working.

The reminder reaches your phone through Chrome, so it is Chrome's settings that matter, not this app's. On Samsung and some other phones:

1. Settings › Apps › Chrome › Battery › Unrestricted.
2. Settings › Battery › Background usage limits: make sure Chrome is not in Sleeping apps or Deep sleeping apps, and turn off Put unused apps to sleep.
3. Settings › Apps › Chrome › Notifications: on.

If you added this app from Samsung Internet rather than Chrome, apply the same three steps to Samsung Internet instead.