If you are unable to add your YouTrip cards directly via your Apple device, you may go ahead and add via your YouTrip app:
1. Open your 'Cards' tab
2. Select the card you wish to add
3. Tap on the 'Add to Apple Wallet' button to be directed to your Apple Wallet
Note: You will not be able to add a YouTrip card via Apple device if the card status is 'Lock'.
If you're still having difficulty, you can learn more on why you are unable to add your YouTrip cards here.
You can also learn more on how to add your YouTrip cards to your Apple Watch here.