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Add me to having the same issue with the front differential. Started about two months ago ('21, m50i, about 47K). Same subtle whining noise that was only noticeable by the front driver. Took it to the dealership but they could not pinpoint where the issue was coming from but indicated that it might be tire issue because the tire showed a little wear on the outer edge.
Wasn't really convinced that an alignment would cause that kind of noise. (Plus the tire wear pattern was not that bad) Thank god I came across this thread and immediately set up another appointment as my warranty was going to hit the 50K mark soon.
I have a really good SA and through his suggestions, we were able to diagnose a bad front differential and they had it replaced under warranty. Whining noise was finally gone. Asked him roughly how much it would cost and he estimated $7-8K; dodged that bullet, whew....
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