Have you checked the basic settings of turbo actuator ?
I have these readings, for an older 2 ltr VAG but not your engine code, so cant be certain they are correct
Engine Group 120, (Or DVM on sensor wire) should be reading between 3.4 & 3.9V no vacuum .
Using a Mityvac, vac the unit up to max correct reading in Group 120 (or DVM) is 0.76V if not adjust turbo rod
When this is set there is a basic setting to carry out to store the readings
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