[DEFECTIVE] LattePanda Alpha 864 Not Powering On

I've tried with different power supplies, which I've tested separately (on the other LattePanda Alphas), and the power supplies work fine, but the Alpha just won't do the blue/red light thing, and I can't power it up using the power button.

I don't have the kit at the moment to be able to test providing power separately other than via the USB-C PD port.

I think the problem might be the same as https://www.lattepanda.com/topic-f10t17147.html, although I'm not sure.

Can I get approval for an RMA?