We are temporarily disabling code redemption while we work to resolve these issues. You will now receive a "Code Redeem Failure" error when attempting to redeem one of the impacted codes.
If you successfully redeemed a code and did not receive your product, we are working on getting those items automatically credited to your account. You do not need to contact customer support at this time.
For any other store related issues, please restart your client. If this does not solve the issue, please contact support: https://mtgarena-support.wizards.com/hc/en-us