Saba Cloud SP initiated Transaction Failing on iOS

Document ID : KB000117160
Last Modified Date : 09/10/2018
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We have a SAML Federation setup as described below. 

CA SSO - acting as IDP 
SABA cloud - acting as SP 

SABA cloud SP initiated transaction is working fine for Android, but the same is failing iOS. 

Mobile app : authentication flow same as form based. 
Android - working 
iOS - not working 

After entering user-name/password, request coming to Access gateway, but it seems nothing is happening between Access gateway and policy server. 

How can we resolve this issue?
SSO version: 12.7 SP2 
OS: Linux Redhat 6 64 bits
Access Gateway 12.7 SP2 
OS: Linux Redhat 6 64 bits
The issue has been identified as an issue with the iOS app. The http to https redirection was not being handled correctly by the app.
The implemented solution was to switch to BASIC authentication scheme which uses the default browser.