Hello Marco_appleGeek,
Thank you for reaching out to Apple Support Communities.
Add a vaccination card to Apple Wallet
With iOS 15.1, you can securely download and store your verifiable COVID-19 vaccination information in the Health app and add a vaccination card to Wallet.2
If you received a QR code
You can scan a QR code given to you by your COVID-19 vaccination or test provider to add your verifiable health records to the Health app.
- Open the Camera app from the Home Screen, Control Center, or Lock Screen on your iPhone or iPod touch.
- Select the rear-facing camera.
- Hold your device so that the QR code appears in the viewfinder in the Camera app. Your device recognizes the QR code and shows a Health app notification.
- Tap the Health app notification.
- For verifiable vaccination records, tap Add to Wallet & Health to add the record to the Health app and Wallet app.
- Tap Done.
If there's a change to your vaccination record, such as receiving an additional dose, you'll need to add a new QR code.
More details can be found here: Add verifiable COVID-19 vaccination information to Apple Wallet and Health
If the issue persists, can you provide a few more details? What happens when you attempt to add your green pass to wallet? Do you have a QR code with your Green pass? Also, who issued the Green Pass?
Cheers!