I am using Google Pixel/Pixel XL (Android 7)

Step 1: Go to "Settings"

Step 2: Tap on "Notifications"

Step 3: In the list of apps, search for "Skooly" and tap on it

Step 4: Make sure that all the three toggles i.e "Block all", "Show silently", and "Override Do not Disturb"are "OFF"

Step 5: Go back to "Settings" and go to "Apps"

Step 6: In the list of apps, search for "Skooly" and tap on it

Step 7: In "Skooly", tap on "Notifications"

Step 8: Make sure that all the three toggles i.e "Block all", "Show silently", and "Override Do not Disturb"are "OFF"