Unable to do App Transfer

We're trying to transfer an app to another account holder and have the following two problems blocking it.

  1. in app purchases: But we don't have any in-app purchases. Not entire clear as to what problem that is supposed to cause anyway.
  2. We are instructed to remove all Testflight builds, yet I can find no place to delete old Testflight builds and in fact, supposedly we're not supposed to be able to do that in the first place.

We get: "You must first remove all builds and testers from the app you want transferred and clear each information field below Test Information."

What gives?

Unable to do App Transfer
 
 
Q