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:
Enable TestFlight by adding a tester to a build
Then deactivate the build, by turning off TestFlight beta testing
Attempt to transfer again
unfortunately, I still haven't been able to resolve the issue.
I just solved the transfer issue, you just need to expire your build from tester by following the steps below. and then app will available for transfer..
open your app and click on testflight then click on the icon of your app as shown in below screenshot.
I was facing the same issue, going inside tranferring app console multiple times automatically fixed the issue and started showing all criteria as met.
Not sure if this is going to help,
Check Users and Roles > TestFlight Beta Testers
Do you have a tester who is testing the app that you want to transfer?
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.
I just solved the transfer issue, you just need to expire your build from tester by following the steps below. and then app will available for transfer..
open your app and click on testflight then click on the icon of your app as shown in below screenshot.
The click on expire build.
Now you can transfer your app :)
I was facing the same issue, going inside tranferring app console multiple times automatically fixed the issue and started showing all criteria as met.