Not just Hybrid/PHEV’s with this problem, there’s been a spate of Enyaqs over the last month or two having problems (mine included) with the 12v batteries, either can’t hold sufficient charge, not getting or being fully charged or just poor quality and dying in the colder weather.
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!