If none of these helps, you may contact Microsoft support here.
Moreover sometimes, simply changing the Internet connection has also known to have helped. Update your payment information, check your order history, redeem gift cards, and get billing help. Look for charges with a status of Completed or Redeemed. Select Payment & billing>Order history, then, under Refine, select the order and date range you want.
Some apps are region-specific, and users can buy them only if their address falls within the permitted region. If you have more than one account, make sure youre signed in to the correct Microsoft account for those purchases.
Enter your details and go to the redeem page here. You will most likely be prompted to reenter your Microsoft account password and select Sign In as a security feature.