美版 Apple Watch Series 5，watchOS 6.1，美区 iCloud ID。
但是有的 App 只有国区有（比方说网易云音乐），尝试安装的时候会要求登陆账号：
Sign in to complete purchase. Enter the password for your Apple ID
输入密码后，会提示未知错误：
Verification Failed. An unknown error has occurred.
手机上切换 App Store 帐号到国区帐号，尝试下载，会提示无法下载：
Unable to Purchase App. Sign in with your Apple ID from the Apple Watch app on your iPhone
我就想在 Apple Watch 上下个网易云音乐，为什么那么难……
但是有的 App 只有国区有（比方说网易云音乐），尝试安装的时候会要求登陆账号：
Sign in to complete purchase. Enter the password for your Apple ID
输入密码后，会提示未知错误：
Verification Failed. An unknown error has occurred.
手机上切换 App Store 帐号到国区帐号，尝试下载，会提示无法下载：
Unable to Purchase App. Sign in with your Apple ID from the Apple Watch app on your iPhone
我就想在 Apple Watch 上下个网易云音乐，为什么那么难……
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