对于那些仍然在Xcode8中与这个问题作斗争的人。对于我来说，这是一个重复的证书问题，这是我解决它的方法:

我读了尼克的回答，然后开始了我的调查。我检查了我的特定案例中的所有密钥和证书(在~/Library/Keychains/System.keychain中)。

When I opened the file, I found that I had two iPhone Distribution Certificates (that was the certificate that Xcode was requesting me), one with the iOS Distribution private key that I have been using since the beginning, and another iPhone Distribution Certificate which its private Key had a name (iOS Distribution:NAME) that wasn´t familiar for me. I deleted this last certificate, started Xcode again and the problem was gone. xCode wasn´t able to resolve that conflict and that´s why it was giving signing certificate error all the time.

检查你的钥匙链，也许你有一个重复的证书。

“启用自动签名”，然后从下拉菜单中选择一个团队，帮助我解决了这个问题。

我也有同样的问题。 我换了mac。当我下载Xcode证书时，我收到了一条错误消息:“错误是安全配置文件不包括证书签名。”

1)登录https://developer.apple.com/account/ios/profile/limited/edit Select the project => edit => Certificates => Select All => Create => Download

2)在Xcode中:项目文件=>签名(调试)=>配置文件=>导入文件=>选择带1的文件

为了解决这个问题，

我只是在项目设置通用选项卡上启用了“自动管理签名”，在启用之前，我担心它可能会有一些副作用，但一旦我启用，它就为我工作了。

I haven't seen this mentioned yet but if you are still having issues after recreating your provisioning profiles, deleting the existing ones you have in your Provision Profiles folder, checking for dupes in your Keychain, etc (all other answers ITT), open your Target > Build Settings > Code Signing and make sure everything looks consistent in there. For example, I had changed the Code Signing Identify for Debug to a Distribution identity, which obviously wouldn't work as the Development Provisioning Profile doesn't have the Distribution certificate and was causing the error in the first place.

检查您的钥匙串，查找缺少私钥的身份。我为同一个团队安装了多个分发证书，其中一个缺少私钥。Xcode只检查密钥链中第一个匹配的标识，并自动使用这个标识，而不是包含私钥的标识。

删除没有私钥的匹配标识使Xcode再次检测到正确的标识。