I bought my S23 ultra from Hong Kong, but Samsung wallet not accept UK debit cards. I had reset my Samsung account region from Hong Kong to UK, problem is still going.
Samsung should consider their policy. Currently, Samsung Wallet is firmware dependence. I hope they can change their setting as Google Wallet. @XavierHKG, Google wallet should be able to use your UK debit card on your HK phone. Please check your Google account region.