Hi insanerob,
This seems to be a common issue with Apple as I have seen many posts online regarding this error. Please try one of these solutions from the first two links, as they seem most straight-forward and easy to test. The third link is to the iOS Development Library page, “Troubleshooting Failed Signature Verification,” which is more general support.
- ios - App Submission: Invalid Binary - Invalid Signature - Stack Overflow
- ios - Invalid Signature (Invalid Binary) on iTunes Connect - Stack Overflow
- Technical Note TN2318: Troubleshooting Failed Signature Verification
If you do not find a resolution from any of these three links, let us know and we will continue to investigate.
Thanks,
.