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
I was facing the same issue, going inside tranferring app console multiple times automatically fixed the issue and started showing all criteria as met.
Another possible reason:
When you delete all test information from TestFlight, make sure you delete it for every language. In the testinformation page, select every localised language and check if the form is empty.
i had the same issue i deleted (mark expired) all the versions of app testing version in App TestFlight section and done the trick for me ;) attach is the screen shot of activity.
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:
unfortunately, I still haven't been able to resolve the issue.