Update: Found similar case where upgrade to 7.0.14 breaks Android VPN
with SAML. Fortinet says this is known and will be released a new
firmware for FC on android (7.2.2) soon.
https://community.fortinet.com/t5/Support-Forum/VPN-not-working-on-mobile...
Ran across the same issue after upgrading our Fortigate 1100's to
7.0.14, have a mix of computers and mobile devices in our environment,
so naturally this "fix" does not help us either.. Please reopen this
topic, thanks! :)