SSO (Single Sign On) - VPN / My Web Application on Apple iOS (iPad)

SSO (Single Sign On) - VPN / My Web Application on Apple iOS (iPad)

Hi,

I have: 
- user accounts in my LDAP server (MS AD)
- VPN with Radius authorization (user in LDAP)
- web application with simple auth (username / password - LDAP)


How I can setup SSO in MDM and user enter login / password once and  and must be authorized in VPN / Web application ?
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