FortiClient 6.4.4 for iPhone: issue with MFA

Hello,

We have an issue with Forticlient 6.4.4 for iPhone/iPad. We've MFA (multi-factor authentication), but on last FortiClient on iPhone, the windows to enter second factor is never displayed.

We've tested with legacy app, and it's working fine.

iOS version: 13.x and 14.x

This windows is not displayed. Instead, the app is put in background