If it’s only when accelerating then it maybe a hose leaking on turbo or something like that. Could be a hose/hole relating to the MAF sensor. Does it happen when you rev the car standing still or only when moving?
 
If it’s only when accelerating then it maybe a hose leaking on turbo or something like that. Could be a hose/hole relating to the MAF sensor. Does it happen when you rev the car standing still or only when moving?
Only when moving
 
When my car was newish, I had a squeal from the DSG, only had it twice both times in hot weather when moving from standstill on a hill.
 
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Same thing, the sound happens specially in hot weather and on a hill moving from standstill
But now it happens more often