SSO Profile is not working as expected in iPad with iOS 8.4

Hi, I am working on creating SSO profile for my corporate websites. Corporate website is hosted in IIS and is enabled for Windows Authentication and Kerberos. I am not able to successfully make SSO profile to work. iPad:iPad2, OS:iOS 8.4. Following is profile configuration.

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple/DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

<key>PayloadContent</key>

<array>

<dict>

<key>PayloadDisplayName</key><string>SSO Settings</string>

<key>PayloadType</key><string>com.apple.sso</string>

<key>PayloadVersion</key><integer>1</integer>

<key>PayloadUUID</key><string>17A4D199-546D-45EB-B3C7-4CA9E42CB6F4</string>

<key>PayloadIdentifier</key><string>A4DOMAIN.SAMPLEDOMAIN.COM</string>

<key>Name</key><string>SAMPLEDOMAIN.COM Domain</string>

<key>Kerberos</key>

<dict>

<key>Realm</key><string>SAMPLEDOMAIN.COM</string>

<key>URLPrefixMatches</key>

<array>

<string>http://WEB.SAMPLEDOMAIN.COM/</string>

<string>http://WEB.SAMPLEDOMAIN.COM:80/</string>

<string>http://WEB.SAMPLEDOMAIN.COM:99/</string>

</array>

<key>AppIdentifierMatches</key>

<array>

<string>com.apple.mobilesafari</string>

</array>

</dict>

</dict>

</array>

<key>PayloadOrganization</key><string>test</string>

<key>PayloadDisplayName</key><string>Single Sign-On Profile</string>

<key>PayloadVersion</key><integer>1</integer>

<key>PayloadUUID</key><string>11EBE298-6E77-4B8B-A39E-0EC2E1EEACE0</string>

<key>PayloadIdentifier</key><string>A4DOMAIN.SAMPLEDOMAIN.COM</string>

<key>PayloadDescription</key><string>Enables Kerberos Authentication</string>

<key>PayloadType</key><string>Configuration</string>

</dict>

</plist>

I am connecting my corporate website with corporate id sampledomain\testuser1 using Safari. But, SSO is not triggered and corporate web server is prompting for user name and password in Safari

Regards