Saba Cloud SP initiated Transaction Failing on iOS

Document ID : KB000117160
Last Modified Date : 09/10/2018
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Issue:
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?
Environment:
SSO version: 12.7 SP2 
OS: Linux Redhat 6 64 bits
Access Gateway 12.7 SP2 
OS: Linux Redhat 6 64 bits
Cause:
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.
Resolution:
The implemented solution was to switch to BASIC authentication scheme which uses the default browser.