In order for your phone or your cleaners' phones to actually make a sound or vibrate to remind them of certain things like clocking out, you'll need to be sure that their notifications are properly set.
Follow these steps:
Step 1:
For Androids:
1-Open your phone's Settings app.
2-Tap Apps & notifications. Notifications.
3-Under “Recently Sent,” tap an app.
4-Tap a type of notification.
5-Choose your options: Choose Alerting or Silent. To see a banner for alerting notifications when your phone is unlocked, turn on Pop on screen.
For iPhones:
1-From the Home screen, navigate: Settings
2-Now scroll and scroll....and scroll, all the way down to find ZenMaid (way at the very bottom of the app list)
3-Click the grey arrow to open up ZenMaid and again in Notifications
4-Allow Notifications should be "ON"
Step 2:
Check that this button is "ON" in the ZenMaid app profile: