Hi there hamdan130,
We see you have an issue with adding a debit card to your Apple Wallet. You mention the error about changing your region, but it sounds like it's set correctly to the US. You will also want to make sure the billing information for that card you want to add is set for a US address.
Then, work through helpful steps in this article: If you can't add a card to Apple Wallet to use with Apple Pay
If you continue to have issues, reach out to the Apple Support team directly. You can reach them here: Get Support
You can also find the support phone number for your region at this link: Contact Apple for support and service
Take care.