What does Xbox live exactly do? Mine expired two months ago and I didn’t notice any change

This is exactly what mines doing, received mine less than 3 months ago. What did you end up doing??

Mine started doing this to me two days ago its less than 20% full it does this constantly and its less than two months old. What is the fix for this I can get nowhete in any game my xbox one x is literally a 500 dollar paperweight at this point.

Same issue for me! What % does your tracker say? Mine says 86% and I did notice that the final barn I found (Spring Season one) made the % go up so it suggests that one or two of the previous barns didn’t affect the achievement tracker :L

Oh ok so what does it do exactly? Ive noticed zero changes

I don't believe they do.

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I bought a 12 month Live code close to two years ago now and used it about two or three months ago for another account. I'd say they don't expire unless they're used or someone gets lucky and activates the code without actually seeing it.