I read lots of things on the internet how HP are very picky about the USB-C power supply and will fail safe and refuse to charge on many 3rd party power supplies.
Knowing I could send it back if it didn’t work for me I bought the UD-CAM docking station and I’m pleased to report it all works perfectly. Charges, HDMI OK, Gigabit Ethernet OK, USB ports OK too. Only think I didn’t try was the analog 3.5mm audio
HP Spectre x360 - 13 aw0054na
Intel® Core™ i7-1065G7 CPU @ 1.30GHz
Windows 10 Pro 64-bit