Says I am not old enough to redeem an xbox live gift card

Hello, it seems that you have restrictions on your account. If you have already been added to a microsoft family please try following the steps on this link Purchase settings for a child account | Xbox Support.

If you are not added to a microsoft family and you do not have an adult account please follow the steps here Create a child account and add family members on Xbox | Xbox Support.

Hi I just added $15 gift card to Xbox live and I’m trying to buy game pass but I entered the number on the gift card for game pass to redeem but it says it’s already redeemed

Yes, I was able to redeem my gift card at one point although I didn't go through with it. I am referring to the 12 month Xbox Live membership which is on sale right now I figured this gift card had enough for it and was hoping that I'd be able to use it
for the sale even though it isn't a specific 12 months Xbox Live gift card, oh so now I'm running into issues again as I've tried to punch in the code a couple more times and no luck

For help with the Microsoft Rewards program, you would need to contact their customer support via their redemption page. Rewards points can only be used to redeem gift cards through the Rewards program, not to be used to make purchases on Live. You would
need to save up enough to redeem an Xbox gift card and then use the money from that gift card.

If you have enough Microsoft reward points, then you need to redeem the reward points for Xbox/Microsoft Gift Cards on the redeem page of Microsoft rewards. Then once the gift card codes have been emailed to you, then you can redeem those gift card codes on https://account.microsoft.com/billing/redeem Once you have enough money from the Xbox Gift Cards, you can then purchase Minecraft from the Microsoft Store or Xbox Store (depending on which version you want).