SOPHOS XG Firewall - Issue with VPN Clientless Access

Hello,

I have an issue with VPN Clientless Access on XG Firewall SFOS 15.01.0.

I try to add a bookmark for an RDP connection to a PC (Windows 10) but if i try to open the bookmark on User Center Portal, i get this message : {"result":{"error":"Session unauthorized"}}

Do you have an idea to solve my issue? 

I have tried this option :

- Create permissive firewall rule

- Change settings for RDP on Windows (uncheck secure connection with NLA)

- Check logs on sophos (but i don't find logs for Clientless Access)

Thanks, 

VK