If you're hearing from testers about being kicked out of TestFlight because of the new account migration stuff, DO NOT update their email. It's a lot of work and will not help them.
For now, you MUST give them a public link, even if it’s a private beta.
Migrations of any kind are difficult, and this one for Apple has taken over a decade, so it's likely that this will be an ongoing issue. But I hope not 
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/cc @Cdespinosa https://mastodon.social/@bigzaphod/113991984644255582
@chockenberry @Cdespinosa Testers see (but probably overlook) this text in the migration screen. Unfortunately, app developers didn’t get a heads up and were a little blindsided when their testers migrated without doing this and then yelled at them.
@Cdespinosa You folks have been working on this long enough that I figured out something didn't go exactly according to plan.
I appreciate the heads up, but without a way to contact everyone in TF, it's pretty hard to get the word out to the folks that need it most. (A lot of folks ignore build test notes, too.)