An App ID with Identifier 'xxxxxx’ is not available. Please .... 1.完全关闭Xcode; 2.找到钥匙串,将钥匙串(Keychain)中的对应证书移除; 3.再次打开Xcode,通过 Preferences - Account 4. 删除原先的账号重新登录, 搞定~