I saw the "charging with reduced power" due to a bad relay in the KLE module, which I had to get replaced. There are two relays and only one was getting triggered, hence some power but not full power.
The "unable to charge" message seems similar to what I saw on DCFC after the mouse damage to my charge port wiring. Since you're trying L2 charging I'd consider possible debris in the charge port sockets, maybe try blowing some air in them? Also check there's no corrosion on the pins of your plug. It's possible you cleaned the pins by unplugging/plugging multiple times.
And as always, go to a different charger and see if you see the same behavior. That could help determine if it's the car or the EVSE.