Can not extend Gold live 12 months

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Yes depending you the code received it could extend your Gold membership by 3, 6 or 12 Months so long as it's an Xbox live gold code

According to the Family Gold plan FAQs, for every 2 months of gold, it would extend your family pack plan by 1 month. For example, if you redeemed a 12-month code, it would only extended your family pack plan for 6 months.

www.xbox.com/.../FamilyPackFAQ

the add says 20% off 12 months of gold your gold is expiring. I click that and my options are (renew gold now) (check out games) ( terms and conditions). So I click renew gold now and I get the games with gold and the option to extend my gold 1 month,
3 months, 12 months which all so regular price no discount. If I click on 12 months and extend which takes me to payment screen at full price then gives an error "try that again something happened on our end. Waiting a bit might help. Waiting doesn't help.

Hi,

thank you for your reply,

Beginning of December I bought xbox live gold for 12 months, which I extended today with 12 months and 6 months. I received an additional month for checking the automatic renewal option for this subscription, so my xbox live gold ran until July 2022, for
a total of 31 months. Afterwards (still today) I paid for the three months of Ultimate Game Pass, which would still not go over the 36 months, but would extend it to 34 months. There is no information whatsoever in my subscription information page linked to
my account as to why the period is now only 27 months, which is not very transparent.

Sven