iPhone 8 camera flash not working in winter weather

Last night I went to Kielder Observatory, Northumberland UK, to see the stars/super moon, and I thought i'd be able to take some stunning photos on my iPhone, however to my disappointment my iPhone 8 plus' (256GB) camera flash did not work whilst I was outside. The temperature was 2.5C and we were only at an altitude on 400m, both of which are inside apples recommended ranges, so why doesn't my camera flash work? How do you stop this from happening? This is not what I expect from a 950 GBP apple device, very disappointing.

Ok, this is not very helpful, used an IP8 above 0 outside today and really needed the flash - I nearly went crazy and thought it was broken until I read this, and tried it inside, where it started to work.. How could it be like this??

I have the same problem. Does anybody now if it's hardware or software issue?

I can't believe Apple doesn't acknowledge this problem at all. They just send us link with acceptable operating temepratures for iphone to work fine, and that's all. But clearly that is not the problem here, since people have these problems when using their phones in temperatures above 0 celsius, and slightly below 0 celsius.

Same problem, camera flash not working, outside +5, you can check weather in Shanghai. Indoor everything OK. IPhone 8+ 256gb 11.2.5

I have the same problem, way above 0. Iphone 8 Plus