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This seems to be a known issue with DNG, and it affects other RAW capture programs as well. So it seems to be something related to iOS or the iPhone X, and not specifically Lightroom.
You can can work around this by switching to JPG when you need to use flash; and we can hope Apple will help apps to enable this soon.
"Mike: and it affects other RAW capture programs as well"
Before I posted this question to the forum I tried the same with 645Pro - application what I am using for a very long time. It also supports DNG. I don't know how it works but you may use flash with the back camera. However, Exif informs "flash did not fire" even you may see the flash activity on the picture. :-)
It seems to be something really wrong with X.
It seems I am having the same issue with my iPhone 8 Plus. flash doesn’t enable when I’m using both front and back camera. Really frustrating. Tried to reinstall it and still had the same issue. Changed and toggled between all modes possible and still nothing. Initially thought it was a feature that came with the premium and wasn’t mentioned. But I paid and still nothing....
As I mentioned above, this is an issue with iOS 11. If you change to JPG mode, the flash is enabled, but in DNG mode, it’s greyed out. This is a problem with iOS, not with Lightroom. I hope it is fixed soon.