I redeemed a 3 month subscription for Xbox live. Can't access it can't sign in

At the time of this posting, there are currently some Xbox Live server issues regarding "Purchase and Content Usage" - namely, this affects buying items on the store and redeeming codes. Since these issues are on Microsoft's end, the only thing to do is
to wait until they fix the server problems. Xbox Live server outages happen occasionally, and the only solution is to have patience.

For now, you can sign up to be notified once the Xbox Live servers are back to normal:
https://xbox.com/status

Just bought a 3 month subscription of Xbox live gold and now I can't sign into my profile? What's the problem?

its a green xbox live gold 3 months card so i can't use it to buy games in game purchases???

You can't buy games or in game purchases with a 3 Month Gold membership card.

But even if you have a subscription, you can redeem the card, and the card will "pause" your renewal payments for 3 months, and after the 3 months of the gold card are over, you start paying normally for your subscription again.

So just redeem it on your account, and you save 3 monthly Gold payments. And even if you have a longer subscription (like a 12 month subscription), it will "push back" the next renewal payment for 3 months.

So for example, if your next renewal were in November 2019, and you redeem the 3 Month card, you'd have to pay for the next subscription renewal in February 2020.

Same problem here. My xbox live gold subscription ended yesterday and can't redeem my 12 month subscription code.

I have this problem too.. Can't redeem 12 month LIVE and 1 month EA Access..