App Store & In-app Purchases not working on iPad

I’ve been encountering a “can’t connect to app store” error everytime I open App Store. I also can’t make in-game purchases through my iPad even if my iCloud and payment details are up to date. These issues are only with my iPad (iPadOS 15.7) — when I do the same things on my iPhone (iOS 16.0.2) everything works well. I’ve also tried different tips online such as signing out and back again, reinstalling the app, enabling in-app purchases, etc. but to no avail. Hope someone can help. Thanks.