12 month subscription code isn't working

Howdy.

One other possibility to consider: Be sure to check the product description at the vendor where you purchased the codes. Some of the 12-month Game Pass subscription codes work on a "12-month token" basis, and only one token can be active on a Microsoft
account at a time. In the case of the 12-month subscription tokens, they do not stack.

To my understanding, if your codes are, in fact, 12-month subscription tokens, you would wait until the first 12-month token expires and then you would enter another code to extend your membership another 12 months.

I don't know whether your situation involves the 12-month token subscriptions codes, but I quote the following product description from a currently popular offer for 12-month Game Pass codes for illustrative purposes:

"This is a twelve-month subscription to Xbox Game Pass. 1 per Microsoft Account Entry per year. If a customer has more than one Xbox Game Pass 12 Month token in their possession, they can hold the additional tokens and enter them in every 12 Months
from initial date of entry."

Yes. Microsoft stated that retail codes will still be accepted and anyone who still has the 12-month subscription will continue the 12-month subscription.

Microsoft no longer sells 12 month subscriptions. You may be able to find a 12 month as a prepaid code in a retailer.

Hi,

First, lets ensure that all your billing information on your account is current/correct. You may do that on Microsoft's Billing site here: Billing-Payments
Afterwards, please ensure that you have no outstanding balances due on your account: Services

After you've done that, please make sure that your account security proofs (Phone number, Address, and recovery email) are current here: Privacy

If you continue to get an error in attempt to redeem your code, please contact Xbox Support so they can take a look into your account and redeem to code. You may do that anytime here: Contact
Support

There is no word on if/when Microsoft will bring back 12 month subscriptions through them.

They quietly discontinued 12 month subscriptions through them a few years ago, but never stated why and only that 12 month prepaid codes would still be available.