iOS TestFlight - External Testers Not Notified of New Build

Question

I have made an app available to external TestFlight users. They have received the email and installed the app as expected. They have version 1.0, Build 1.

However, I hav

Answer 1

This is a bug from Apple. What finally solved for me was keeping the "Automatically notify users" checkbox unchecked during the process to invite the users and then AFTER the invitation is complete you go into the build and click "notify users" on the top right corner.