Fortigate Web Portal RDP RemoteAPP Issue

Hi there!

We have published PC via Fortigate Web Portal. And everything was fine. PC has remoteApp inside, and we noticed next issue - hotkeys works only in PC, and doesn't work in remoteapp. If you connect to PC directly without WebPortal, hotkeys will be work fine.

Any ideas how to correct hotkeys in remoteapp (Fortigate Web Portal - Web RDP PC > RemoteAPP)?

Fortigate 201E

FortiOS v5.6.6 build1630 (GA)