I need to add a debit card to the wallet so that to use Apple Pay but I can’t. Can you help please. Thanks

1. Start by going to settings>general>reset>and reset all settings.
2. Sometimes if you sign out of your Apple ID and back in it resolves the problem.
3. Make sure you are using the latest iOS/macOS update.
4. Make sure that your date and time is correct under Settings > General > Date & Time.
5. Make sure that you are connected to a known-good network and are not connected to a VPN.
6. Make sure that push notifications are set up correctly: Use notifications on your iPhone, iPad, and iPod touch.
7. Make sure that your zip code is accurate under Settings > [your name] > Payment & Shipping.
8. Check your Apple ID region to make sure it is correct. If it is correct, you may need to select the same region again. (Change your Apple ID country or region - Apple Support)
9. Check the region on your device to ensure it is correct (Settings>general>language & region - set to your region). If it is correct, you may need to select the same region again.
10. A passcode is required to use the Wallet app. 
11. You need to be in a region that supports Apple Pay - Countries and regions that support Apple Pay - Apple Support
12. Your bank needs to support Apple Pay - Apple Pay participating banks - Apple Support
13. If none of these suggestions are able to resolve your issue you can go here for further assistance - If you can't add cards to Wallet for Apple Pay - Apple Support
14. Apple Pay support can be reached here - Apple Pay Customers

• If you need to change your default payment in Wallet or have other issues such as the inability to add passes you can go to these links which covers managing Wallet and wallet use.
• Add and manage passes in Wallet on iPhone - Apple Support, please note that passes cannot be directly added within wallet, except for QR code enabled passes. For everything else, its done either through the associated app, an email, airdrop or a link in a website.
• If you get an error that you already have the maximum amount of cards in wallet with less than 12 cards (iPhone 8 or later) 8 Cards (all models earlier than iPhone 8) signing out of your Apple ID and back in usually resolves this issue.
• If you are getting a message to contact the card issuer, call the bank or credit card company who issued you the card to make sure there are no restrictions on the card. 
• If you are getting a message that Apple Pay services are unavailable at this time, sign out of your Apple ID and back in.
• How to use Wallet on your iPhone, iPod touch, and Apple Watch - Apple Support,
• Manage the cards that you use with Apple Pay - Apple Support
• Add an e-Money card in Apple Wallet to use with Apple Pay - Apple Support
• Set up a Suica or PASMO card in Apple Pay - Apple Support

I understand.

That's why I offered the list.

All I can do at this point is to suggest that you contact Apple Support. 

Please check this list to see if you qualify. 

Here are some contact options. 