I'm running into 2 issues that I'm not sure how to solve regarding validating apps to publish to the Mac App Store.
A new Version of iTMStransporter is available on the early-access update channel. Specify '-updateChannel earlyAccess' on the command line to test it out.
---Irrelavant issue about sandbox---
Your version of iTMSTransporter will be updated in approximately in 2 days.
I have looked into the App Store and I have not found anything that seems relevant. Executing that command returns command not found: -updateChannel
This solved my problem:
/Applications/Xcode.app/Contents/SharedFrameworks/ContentDeliveryServices.framework/Versions/Current/itms/bin
./iTMSTransporter -updateChannel earlyAccess
in the cmd