The same thing happened to me too. I tried 4 different chargers, slow and fast: several android phones, steam deck and macbook. It didn’t charge through any of these.
I’ve filed a ticket with the ohdoki customer support and got a replacement device sent to me in the end. The new one charges just fine through any of the chargers I have as expected.
Although the customer support didn’t go flawless. I had to send some short videos, gather device logs and overall it took almost 2 weeks before the decision was made to issue me a replacement device. It took 2 additional weeks before the device was actually sent to me (not delivered, but sent from their shop).