Question: Purchase failed...
> I am using an application from the Japanese iTunes Store (so I have a Japanese iTunes account).
> I purchased a gift card, and I redeemed it.
> It worked. I could see the balance.
> I tried to purchase in-game purchase. It didn't work. It also showed error code 
> I tried to get to the Appstore to purchase something small just to see if it worked.
> Result: No. I can get everything that is free, but not anything with a price.
> I thought it was a region lag, because I use 2 accounts, 1 Japan and 1 US, and I switch between them a lot.
> I tapped on "Region" to change it to US and then change back to Japan.
> But it didn't let me. It told me I have balance, and have to spend them all before changing region. That means I do have the money in my account to spend.
> On this account, I don't have any credit cards as Payment. I have been using the option "None" since the beginning, and I have been buying gift cards online and redeem them.
> Please help me, what should I do?
iPhone 8 Plus, iOS 11.2