I have the same issue. My Apple ID is registered in Kazakhstan, but I'm not a citizen of Kazakhstan. However, my W-8BEN form is locked and shows the wrong country of citizenship. I contacted both Apple Finance and Membership and Account Support five days ago, but I haven't received a response yet.

Hi! I have the same issue. Did you manage to fix this? And did you ever get a response from Apple Support?

Hi, I have the same issue. Did you manage to fix this? Did Apple Support get back to you?

Same problem. Wrong citizenship is locked and no responses from support yet.