it's been 10 days since my last reply for Apple's tiny remarks. The transparency here is a must

I was dealing with that issue caused by Xcode 16. I switched back to Xcode 15 for now and it started working again.

I have the same issue. After installing CER on iPhone 15 Pro, iOS 17.6.1, no cert is shown in Certificate Trust Settings. Btw. cert has a common name set.