Look in the "Radio" or "Navigation" section. Most VW Alpha units came with a small Radio Card inside the manual that listed the serial number and the 4-digit code.
Proceed to "How to Enter the Code" below. vw alpha radio code 2021
Once the correct code is displayed, press and hold the right arrow button or the "TA" and "TP" buttons simultaneously (depending on your specific Alpha model) for several seconds until the radio activates. Look in the "Radio" or "Navigation" section