Change the number of blinks from 3 to 4 or 5.
The official source for VCDS. While not a single "PDF," their wiki is the most reliable place for coding data.
The most sought-after VCDS coding lists are collections of these "tweaks." Based on community-sourced PDFs and forum guides, here are some popular modifications you can perform:
Select -> [Adaptation - 10] -> Enable Spiegelverstellung-Spiegelabsenkung bei Rueckwaertsfahrt .
Search for channel: Comfort Turn Signals (Cycles) or Turn signal control-Komfortblinken Blinkzyklen
Cause: This occurs if your control module hardware does not physically support the feature you are trying to activate, or if a prerequisite configuration is missing. Double-check your coding steps or look for a necessary security access code.
An aesthetic modification that alternates the flashing behavior between the inner and outer tail lamps when signaling. Select Go to [Adaptation - 10]