You need a couple of adapters. The first adapter here converts your 10-30 socket to a 6-20 socket.I think the point is that if one has a 240V line, and a $30 adapter with the OEM EVSE will services 100% of your home needs, then why bother investing several hundred more dollars for a 30A EVSE that only charges at double the speed?
What is the adapter mentioned?
The dryer outlet I have is what this plug is used by the dryer, a 3 connector plug. View attachment 109481
The second adapter (note that it's unavailable here on Amazon) is important. It converts a 6-15 (which is 240V) into a 5-15 (which is 120V) without changing the voltage. It's a specialized used for plant grow lights. You'll see lots of these that are the other way around, converting a 5-15 plug to a 6-20 socket. It won't work here. I have a link posted in another thread to a place that still sells them for $15. If I can locate it, I'll update that information here.