I'm really curious: Did that CCS charging to 100 % maybe work somehow and did balancing on a CCS really happen?
(I understood the manual that this is done only when the bike is on AC.)
Another thing you could try when charging AC at home is to limit the current (Ampere): Keep the bike switched on, connect the charger, wait until the charging menu appears, then toggle the Amps with lefthand switch.
My thinking is, that due to some twisted reason maybe your home grid refuses to charge the bike because of the additional load. I know it's a very slight chance that this is the reason. But trying cannot hurt, right?