One Idea that popped into my head after I posted my initial response was that you need to make sure that you have a USB-C cable that is capable of charging. One flaw with the EU’s regulation requiring adoption of USB-C connections is that there are different types of USB-C cables. Some cannot be used for charging - just data transfer. It can be very difficult to tell at data-only cable and a charging-compatible cable.
It's not a flaw in the EU regulation that there are different types of USB-C cables. That's the market responding to demand for more- or less-capable (and there more- or less-) expensive cables for different uses, and a lack of standards (i.e.: color, connector plastic housing shape, whatever) that would make it easy to identify whether a particular cable only has capability A, or A & B, or A &B & C, or only A & C, or only B & C, or adds capability D too, or ...
It's easy to blame The Gu'mint for all our ills. But that's not what got us to the place that the EU responded to consumer demand for better standards. The free market being free and uncontrolled got us here.