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Out of curiosity - why do you want digital signal? From what I've read the default lightning - 3.5mm is properly good.
The almighty Ken Rockwell has a good writeup: https://www.kenrockwell.com/apple/lightning-adapter-audio-quality.htm
Forks sake, the third party lightning-USB A OTG cable + Fiio supplied USB A - USB C combo doesn't work either to get digital audio out of my iPhone, also.
Apple y u make it so hard to get digital audio out? With my Mac I had to end up installing a third-party app (Lossless Switcher) to get hi-res out.
Edit - Come back to it, and it now does work with my iPhone, but doesn't want to do hi-res (it's turned on in Music settings)