This is the first question I have ever posted.
I am trying to run an Xcode 9.0.1 project on an iPhone 6 Plus, and these three errors appear:
Code Signing Error: The username or passphrase you entered is not correct.
Code signing error: “iOS Development” signature certificate was not found: No “iOS Development” signing certificate corresponding to the identifier of the KP3X78QM3M command ID with the private key.
Code signing error: for the product type, the signing of the "Application" code in the "iOS 11.0" SDK is required
I suspect this is because Xcode was unable to read the developer certificates on my computer. This General tab looks like under Signing . Clicking "Try Again" will create a new certificate, but all errors still remain.
I tested the Keychain Access app and it has an iPhone Developer Certificate , although I'm not sure if something else is missing.
I looked at similar questions and started reading the Apple Xcode troubleshooting guide, but I'm still confused and don't want to accidentally change anything important.
I desperately need to fix this problem; if there is an Apple support email or someone I can personally contact, it will be awesome.
Thanks in advance!
source