iOS 11 can't download my app to the end

[jmburnod]

Hi All,
Until today that worked fine but one beta tester said me he can't download my app to the end in his iPad using iOS 11 (I can download my app using iOS 10.3). Certificate and provisionning profile are ok.
( LC 8.1.6, xCode 8.3.3)
Any idea to get out this issues ?

Edit: It worked with a beta version of iOS 11
Best regards
Jean-Marc