iOS FortiClient Connection To Sharepoint

Greetings

I have the current iOS FortiClient installed. I have configured two bookmarks, one for a standard HTTP site, and one for a sharepoint site, both of which are internal to the private network I am accessing.

When I connect to the standard site, it works.

However when I connect to the sharepoint site, all I see is the browser spinning.

I've tried a couple of the SSO settings (static, auto, and disabled) but I always get the same result.

Is there some magic for getting the Sharepoint site to prompt me for my username password and/or use the same credentials I connected to the VPN with?