这是 Apple Watch 上的权限问题.

This was a permissions issue on the Apple Watch.

修复:

1. 手动启动应用程序一次(不是通过 Xcode).

1. Launch the app once manually (not through Xcode).

您将看到以下消息:

不受信任的应用开发者
您是否相信开发者..."会在您的 Apple Watch 上运行应用程序?
[信任]
[不要相信]

Untrusted App Developer
Do you trust the developer "..." to run apps on your Apple Watch?
[Trust]
[Don't Trust]