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22-07-2023 06:27 PM - last edited 22-07-2023 06:28 PM
There's a Galaxy bug in most series of the phones that if you setup the phone on WiFi not with sim initially it never updates it's CSC (Country code) from the generic EUX (Europe) to the proper specific country/network codes.
Samsung have actually worked against the community locking down alternate ways to change this code after setup, and they say you need to send phone for repair to fix this. There used to be a way of restarting the phone without sim, off wifi, and kicking it back into line, doesn't work on more recent devices.
I had exactly your symptoms, couldn't open Samsung Wallet, wasn't eligible for free Disney+ etc because my phone wasn't recognised as UK.
I fixed it by using a tool available online called SamFW. Google it yourself and look at reviews etc for your own sanity. It has many more functions, but for free you can change your CSC. I changed to EVR (EE UK) from EUX and it worked fine. Wallet and my Samsung offers now work fine.