I’ve been through some frustrating Xcode-to-Watch connection issues myself while developing a watchOS app. Just to clarify, when you say the iPhone is incompatible, do you mean your app is watchOS-only? If so, the paired iPhone can still be useful for establishing the development connection, even though the app itself doesn’t run on the phone. Have you tried connecting your paired iPhone to the Mac via USB, with Developer Mode enabled on both the iPhone and Watch? I realize you’re running beta versions, so this could also be a CoreDevice tunneling issue, but that might be worth checking before digging deeper.