SAML2 setup on IIS not working?

Product: PowerShell Universal
Version: 3.4.1

Currently i have Windows auth setup on IIS working well with AD group claims setup using the http://schemas.microsoft.com/ws/2008/06/identity/claims/groupsid schema.

I am now wanting to setup SAML2. Iv added the following for the setup i have blanked (XX) this out for security.

Entity ID: xx
Identity Provider Entity ID: xx
Metadata Address: xx
Return URL: xx

I have restarted IIS but it still uses the Windows auth. I assume i need to make other config changes to make it auth via SAML2?

Cheers!