Hello Andrew Lent,
Thanks for reaching out to Microsoft Community.
We understand how important this setup is for you.
If I may ask, were you trying to charge another device from the USB-C port of Surface Go 3? Or were you trying to charge your Surface Go 3 via its USB-C port?
I would like to inform you that if you're trying to use the USB-C port for power delivery, then you might need different power supply or USB Type-C PD charger rated at 60W or higher.
Let me know if this helps. Otherwise, don't hesitate to respond to this thread if there’s anything else that needs to be addressed.
Regards,
StevenK