iTunesConnect: cannot transfer app because of “You must turn off TestFlight beta testing for the app that you want to transfer”

Question

Below you can see that testing for external testers are turned off:

same for internal testing:

but when I transfer app, one of the criterias are not me

Answer 1

I have the exact same issue and I'm currently getting from Apple "our engineering team is still working diligently to have this resolved for you". I have been supplied with a workaround:

1. Enable TestFlight by adding a tester to a build
2. Then deactivate the build, by turning off TestFlight beta testing
3. Attempt to transfer again

unfortunately, I still haven't been able to resolve the issue.