I discovered that not all USB PD (even at 45w) can power the arcadyan. For example I bought this for my van.

https://www.amazon.com/dp/B096LRG1VM?psc=1&ref=ppx_yo2ov_dt_b_product_details

Turns out it doesn't supply 15v.

I've ordered this one and will play with it this weekend.

https://www.amazon.com/gp/product/B09YTWNCM2/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

specifically states 15v at 3 amps.