Keep in mind I don't know what you bought exactly. Maybe this? https://www.amazon.com/120-240V-Portable-Electric-Charging-Universal/dp/B07Y7HPKB6

For THAT model you'll need the usual 120V 20A outlet and circuit. But you claim you upvolted that to 240V so 15A is not a proper outlet and you risk fire along with the breaker tripping.

The model I linked to does not give any indication it will draw less than 16A on either 120 or 240V.

I own another model that allows for setting the Amperes such as https://www.amazon.com/120V-240V-Adjustable-Electric-Charging-Compatible/dp/B0BRT9L7C6 but I don't see an adapter for a 120V socket.

-> From what I can gather so far, you have the wrong 120V outlet (needs to be 20A.)