I have 3, earliest circa 2016/17 or so, newest 2024, all work and charge fine.
Like rock' mentions, make sure power switch is in the "ON" position. Not sure if actually prevents charging since I've always charged them that way as recommended, but it might! They don't seem picky about the particular charger. I've used a few different 12V power supplies in addition to the ones they came with and they all have worked.
Do the charge level indicator lights illuminate when the charger is plugged in but with the power switch in the "OFF" position? That's normal behavior and at least indicates the charger and the connection to the battery are both working at least.