Difficulty updating apps on iPhone — app not available in country/region

I am difficulty updating certain apps on my iPhone 13 iOS 18.7. I keep getting the error message that the app is not available in my country / region.

I live between the US and France and have several apps for my accounts on US sites such as AARP and US financial institutions.

I’m currently in the US and have changed the region on my iPhone to US. The VPN is off. Still I get that error messages and am blocked from updating the apps. (Required updates.)

How do I unblock this? What else do I need to change ?

Thanks for your help.

Mark Uhrich