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Working at a Swedish POS company named Leeroy, and I experienced the same thing two days ago. I figured out that the cause of the printer (Epson TM-T88VI) not being discovered was that the project was built using Xcode 12.2. Looking at the Epson SDK's version details you can see under "[Development Environment]" that the highest supported Xcode version for the current highest SDK version (2.17.0 as of writing this) is Xcode 12.1. I then reverted back to building the project with an earlier Xcode version we used recently that is <= 12.1 (namely, for some unrelated reasons we use Xcode 11.5), and the printer is again being discovered, hooray. So, if you are using Epson SDK 2.17.0 you should probably be using Xcode <= 12.1. Also, good to know is that there are some caveats with having to build with an Xcode version < 12 and running and debugging the build on an iOS 14+ device. There is a very good article about this, and how to work with the situation on Medium named "Debugging on iOS 14 With Xcode 11". Hope this can be of any help. Best, Victor