When trying to deploy your build via Fastlane (or the Deploy to iTunes Connect with Deliver step, which uses Fastlane), you encounter the following error:
Transporter transfer failed. There was a general exception while executing An exception has occurred: issuerId is required
This is an issue connected to Fastlane, but you can work around this issue by adding an Env Var to your Workflow:
ITMSTRANSPORTER_FORCE_ITMS_PACKAGE_UPLOAD = 'true'