Similar issue. I've only had the earbuds for about a week. During Teamscalls, I'm getting a crackly static that happens only when voices reach peak loudness. It seems like some kind of clipping/distortion. Only happens in the left earbud, and it's happened with both my Surface Laptop and my iPhone. So far playing music or other video tracks has not manifested this problem. I'm not sure if this issue is coming from Teams or is a problem with the earbud itself. I'm on the verge of returning/replacing the earbuds, and it would be great to know if this problem is universal (i.e. software/system related) or just a random hardware issue.
On an unrelated note, when charging the earbuds, the Right earbud never shows up as fully charged in the Surface Audio app during charging, even though it shows as 99% charged when I start using them.