hi I am having the same issue. I went through a whole set up process with a MS agent but he couldn't resolve it.
My issue is exactly the same in that the left earbud crackles when any sound is being played through M S Teams i.e. voice etc. The Earbuds seem to pick up my voice without any issues I.e. the people I am talking to don't notice an issue with me.
As per the other user, the issue seems to be related to the way the earbuds interact with MS Teams, as they work fine with other audio outputs.
Following the support the MS agent suggested a replacement set of Earbuds as he thought that my pair may be faulty. I have returned mine today and ordered a new pair as I really like these earbuds, but seems like this may not solve the issue.