There's about 20 internal testers on our Testflight account, but a couple of them just never ever receive the invites/redemption codes so its impossible to get them set set up to be able to test the app.
They are added to the Internal Testing App Store Connect Users group, and I've also tried creating a new group and adding them to that as well as and instead of the App Store Connect Users group. These groups are added as testers of builds, and for the other 20 users their status says "Installed" but for a couple of testers their status always shows as "Invited Resend Invite".
The problem is, even if I click on Resend Invite an infinite number of times, these testers never receive anything. Never. Not after waiting an hour, 10 hours, a day, a week, a month. Click on click on click on Resend Invite and it does nothing, they never get anything. No emails are not going into their trash/spam folder.
I've tried deleting the testers entirely from the entire developer account, and then when I re-add them back, then in that case they do get an email inviting them to join the developer account, but then they don't subsequently receive a TestFlight invite / code when added to a build.
The internal testers are all members of the same organization, so all have the same form of email address which is being used. 20 or 30 or them its ok, but for a couple of testers Testflight just hates them.
For one user, we tried everything and spent literally weeks, just was never ever able to get them set up and eventually had to give up. Our IT department had to specially create a new email for them, just to try and get them added to TestFlight. Hey and guess what, the new email worked, while the old one never did. But this isn't a solution, can't ask the IT dept to create new emails, and shouldn't have to.
But now the same thing is happening again to another tester.
Why does clicking Resend Invite not do anything? How can I force things and get this tester to receive an invite?