2018 Gem e6 Charger Issues - HELP!

Help!! I’ve just replaced ALL batteries in my car and am STILL getting a VEH FAULT code of 520508-7. Car drives and runs as normal but the charger isn’t cycling on. What am I missing?!

I would ignore the code if you don’t have Polaris-Wrench, and fix the charger.
What code does the charger blink? (if it’s a DQ)