We have this issue too. How can our iOS engineering team do their jobs without access to testflight if we adopt managed apple ids? The only reference on the topic is here: https://support.apple.com/guide/apple-business-essentials/service-access-with-managed-apple-accounts-axm171b3ee95/web which cites "privacy concerns" as a nebulous non-reason. Our teams that own mobile software need to use testflight to test release-track builds.