If you go into the trouble shooting section of the AP, and then one says something about the TCU. In there you should find 10 items. Do them in order following all the instructions that it gives you.
I used my VCDS last night to do it and was able to run them all except the syncro point one. Might update the AP to the beta version so I can use it and see if that lets me reset the syncro one. VCDS gave me a requirements not met / sequence error.
You ran every one of the TCU reset/calibration items in the order listed?