FortiClient VPN ( Android) - Ike2 I can't use SSO with pre-share key

Hello, on my VPN IPSEC ike2 I can access  with the Iphone APP, but I can't access my VPN with the Android app. I want to use pre-share key with SSO but the menu doesn't appear... the option only appears when I select certificate. But I don't want to use certificate. I think this will be a BUG in the application.