can not add new debit card

Are you in a country or region that support Apple Pay?

Countries and regions that support Apple Pay - Apple Support

Does your financial institution support Apple Pay?

Apple Pay participating banks in Asia/Pacific, Africa, Europe Latin America, Middle East and United States - Apple Support

If you’ve confirmed the above, please update your iPhone to the latest iOS, 16.5.1 or higher. Older iPhones may only support 15.7.5, but Apple Pay will function.

Update iOS on iPhone - Apple Support

Once updated, please do a forced restart of your iPhone.

Force restart iPhone - Apple Support

Make sure you are signed into your Apple ID/iCloud account on your iPhone.

Follow the steps in this support article for adding credit/debit cards to your Wallet.

Set up Apple Pay - Apple Support