Adafruit USB Type C Power Delivery Issues

[K5CHA]

Hello all, I'm using a USB-C power board to deliver 12V @ 1A but when I wire it up to the DC connector it seems like it's getting low-power. Screen is dim and there's a bit of a hum
If I connect the USB to power, then it seems to have full power. Any thoughts on why is being underpowered?
edit: this is weird, now it's powering up fully and with a multi-meter I'm only getting 9v. I'll troubleshoot on the USB power side.
edit: switched my USB-C to a new one, and now it's negotiating 12v. Woo!
https://www.adafruit.com/product/5807

[dl6sez]

Hello OM,

better use a battery like 3x 18550 Lipo because these USB-C/any switching power supply generates hum spurs and you will not be lucky with tgem and (tr)uSDX.
Linear regulated power supply or battery is the only good choice for it!

73 de Chris