I have the very same issue. I converted my personal developer account (in Germany) into a business account (in the States) when I founded my business there. DUNS has the correct (US) address in their records, but App Store Connect still shows the old (German) address - even on the main page, which is different from the OP's situation. I cannot change that address there. I don't even live in Germany anymore... What a mess.
Topic:
App Store Distribution & Marketing
SubTopic:
App Store Connect
Tags: