To ensure you receive push notifications from your Pass, make sure Notifications are on for both your Wallet app and your Pass.
iOS
Turn on Wallet Notifications
Go to your Settings > Notifications > Wallet and make sure notifications are allowed.
Turn on Pass Notifications
Wallet app > Pass > Tap on ••• > Pass Details > Allow Notifications
Android
Turn on Wallet Notifications
Go to Settings > Notifications > App notifications > Google Wallet and make sure all notifications are allowed.
Turn on Pass Notifications
Google Wallet app > Select the Pass > Tap on ••• > Pass Details > Enable Get notifications for this loyalty card