Still here with same problem.
donphelippe
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In my case testers were added first as external testers and later as internal testers. This is what Apple Support send me:
If the tester is listed as an internal and external tester under the same name or email address.
The tester should:
1 Press the Stop Testing button in the TestFlight App, if visible.
2 Delete and reinstall the TestFlight app.
You should:
1 Remove the duplicate user from internal and external testers.
2 Resend the invitation as an internal or external tester, but not both.
If this doesnt work then pleas provide the following information, To better assist you, ....